minor. We agreed that it had probably been performed for cosmetic reasons.”
“I think we were wrong,” Conway said. Excitedly he went on, “Consider the physical organization of this group entity. At the head is the most mature, male adult and at the tail the most recently born infant, although as we know the infant grows to physical maturity without separating from the parent. Between the head and the tail there is a gradual and steady progression from the most elderly and intelligent male entities down to the increasingly youthful and female segments which form the tail sections. But Prilicla has reported an anomaly in this progression. Young CRLTs positioned relatively close to the tail show evidence of greater physical age and brain development than entities in the midsections. Until now 1 could see no reason for this anomaly.
“But now let us suppose that this group entity,” he continued quickly, “forming as it does a complete colonization project, has been artificially lengthened. The extraordinarily large number of individuals in this group entity has always bothered me, and now there is a simple explanation for it. Let us assume that there is one head or. more accurately, a fairly large number of linked elders forming the leading segments, and several tails connected one behind the other. These would be very youthful tails because it must be much easier to carry out the surgical modifications on young CRLTs which enable them to link up. So we have this colonist group entity with intelligence and experience at its head and linked to a number of young and inexperienced subgroups forming an artificially lengthened tail. The joins between these subgroups are surgically assisted and, I feel sure, temporary, because once established on the target planet they would be able to separate again, and in time the young heads would grow to full adulthood and the dangers from inbreeding would be avoided.
“Perhaps the head on this group entity has also been artif-ically extended,” Conway added, “so as to include elder CRLTs with specialist experience relating to the colonization project who would be available initially to protect the younger group entities, and subsequently to teach and train them and pass on the knowledge of their race’s history and science.”
Prilicla had flown closer while Conway had been speaking and was hovering a few inches above the Doctor’s head. It said happily, “An ingenious theory, friend Conway. It fits both the facts as we know them and the type of emotional radiation received from the beings.”
“I agree,” Murchison said. “I, too, found difficulty in accepting the extreme length of this group entity, but the idea of a wise old head acting as guide and mentor to an as yet unknown number of young tails is much easier to believe. However, I can’t help remembering that it was the head segments which suffered most of the casualties. Perhaps the head is no longer as wise as it should have been and an awful lot of vital knowledge has been lost to this multiplegroup entity.”
Colonel Okaussie waited for a moment to see if anyone in the medical team would speak, then he cleared his throat and said, “Maybe not, ma’am. Most of the head segments who were killed in the collision were very close to the stern and to the ship’s control and propulsion centres. One could reasonably expect that these segments were the beings charged with the responsibility for operating the ship and carrying out the landing maneuvers, functions which are now the responsibility of the Monitor Corps. It is likely that the scientist and teacher segments were positioned a little farther back in the chain and the majority of the casualties were suffered by the vessel’s crew, whose specialist knowledge would no longer be of vital importance to the colonization project after the vessel had landed.” Before Murchison could reply Naydrad gave an impatient, modulated growl which translated as “Why don’t we stop talking and get on with the job?”
The screen which had been used to communicate with the CRLTs was continuously displaying distant and close-up views of spacesuited figures of various physiological classifications busily at work on the final stages of the coilship’s reassembly. Conway could not decide whether Descartes'^ commanding officer was screening the material to be helpful and informative or as a means of suggesting, very subtly, that the medical team display a similar degree of industry. The attempt was a failure in either event, Conway thought, because the Rhabwar medics were far too busy to look at Okaussie’s pictures. They were concentrating instead on measuring and remeasuring the features on the CRLT interfaces and charting with their scanners the paths of underlying blood vessels and the distribution of the nerve ganglia. And with great care and accuracy they were marking the areas where surgical intervention was possible without causing either a major hemorrhage or sensory impairment.
It was slow, tedious work and visually not very dramatic. Colonel Okaussie could be forgiven for thinking that the ambulance ship personnel had gone to sleep on the job.
“Friend Conway,” Prilicla said at one particularly awkward stage, “the physical differences between these two entities are so marked that I cannot help wondering if they belong to different subspecies.”
All of Con way’s attention at that moment was concentrated on what seemed to be the main sphinctor muscle on the rear interface of the forward CRLT, so that by the time he was ready to reply Murchison had done it for him.
“In a sense you are right, Doctor Prilicla,” she said. “It is a natural result of their method of reproduction. Think of this forward CRLT when it was the last and female link in its group-entity chain. In due time it grew to maturity and, still attached to its parent, it was fertilized by the male head of another group entity. Its own infant grew and became mature and in turn produced another, and the process continued with different male heads adding their individual sets of genes at every stage. 'The physical connection between any given CRLT and its offspring is perfect,” she continued, “and perfect fusion may even be possible between a parent and its grandchild or greatgrandchild. But the effect of different males fertilizing each new endlink in the chain would be cumulative. So it is understandable when you think about it, Doctor, that the differences between the fusion interfaces of these two, which were separated by seventeen intervening segments, are considerable.”
“Thank you, friend Murchison,” Prilicla said. “My brain seems not to be functioning properly.”
“Probably,” Murchison replied in a sympathetic tone, “because your brain is more than half asleep, like mine.” “And mine,” Naydrad joined in.
Con way, who had been trying not to think of how long it had been since he had last eaten or slept, decided that the best way to deal with an impending mutiny among his overworked medics was to ignore it. He indicated a small area on the rear interface of the first alien, midway between the central conical depression and the upper rim of the interface, then pointed to the corresponding area on the forward face of the second one. He said, “We can safely ignore these reproductive organs in both creatures, since this kind of link-up is temporary and physiologically independent of the parent-offspring fusion mechanism. As 1 see it the three areas we must concentrate on are the central conical projection and its corresponding recess, which are the connecting points for the central nerve core and our primary concern. Second is this narrow, semirigid tongue with the fleshy mushroom at its tip which locates with this slit in the other—”
“That connection is also of vital importance,” Murchison broke in, “since it links up the nerve networks controlling the voluntary and involuntary muscles which move each CRLTs legs and enable the group entity to walk in unison. There would be small advantage to the group entity if it could share mentation but a number of its segments were unable to walk.” “Friend Murchison,” Prilicla said timidly, “it seems to me that the original nerve impulse from the head segment, or whichever individual CRLT was responsible for initiating the movement, would not be sufficiently strong to trigger the ambulatory muscles throughout the enormous length of this group entity.”
“That is true,” the pathologist replied. “But there is an organic amplifier, consisting of a bunching of nerve ganglia situated just above the womb, or the position where the womb had been in the males, in an area where the surrounding tissue has a high mineral content and is particularly rich in copper salts. This biological booster ensures that the ambulatory muscles receive their signals with undiminished strength throughout the length of the chain.”
“Third,” Conway said, raising his voice slightly to discourage further interruptions, “there are these four flaps of muscle which terminate at their apexes in osseous hooks which locate in these four bone-reinforced orifices in the second creature. This is the primary mechanism by which the individual segments are held together nose to tail, and in this instance—”
“It is also the method by which the CRLT female at the end of the line held onto its developing offspring,” Murchison broke in again. “At that stage the offspring had no choice in the matter. But as it matured, produced its own offspring, and moved farther up the line I feel sure that voluntary separationbecame possible. In fact, separation would be necessary during activities which did not require the entire group entity for their performance.”
“That is most interesting, friend Murchison,” Prilicla said. “I should think that the first time such a voluntary separation took place a certain amount of psychological trauma would be present. It would be analogous to a
