The ways in which a crowd perverts any event of which it is a witness ought, it would seem, to be innumerable and unlike each other, since the individuals composing the gathering are of very different temperaments. But this is not the case. As the result of contagion the perversions are of the same kind, and take the same shape in the case of all the assembled individuals.
The first perversion of the truth effected by one of the individuals of the gathering is the starting-point of the contagious suggestion. Before St. George appeared on the walls of Jerusalem to all the Crusaders he was certainly perceived in the first instance by one of those present. By dint of suggestion and contagion the miracle signalised by a single person was immediately accepted by all.
Such is always the mechanism of the collective hallucinations so frequent in history—hallucinations which seem to have all the recognised characteristics of authenticity, since they are phenomena observed by thousands of persons.
To combat what precedes, the mental quality of the individuals composing a crowd must not be brought into consideration. This quality is without importance. From the moment that they form part of a crowd the learned man and the ignoramus are equally incapable of observation.
This thesis may seem paradoxical. To demonstrate it beyond doubt it would be necessary to investigate a great number of historical facts, and several volumes would be insufficient for the purpose.
Still, as I do not wish to leave the reader under the impression of unproved assertions, I shall give him some examples taken at hazard from the immense number of those that might be quoted.
The following fact is one of the most typical, because chosen from among collective hallucinations of which a crowd is the victim, in which are to be found individuals of every kind, from the most ignorant to the most highly educated. It is related incidentally by Julian Felix, a naval lieutenant, in his book on Sea Currents, and has been previously cited by the Revue Scientifique.
The frigate, the Belle Poule, was cruising in the open sea for the purpose of finding the cruiser Le Berceau, from which she had been separated by a violent storm. It was broad daylight and in full sunshine. Suddenly the watch signalled a disabled vessel; the crew looked in the direction signalled, and everyone, officers and sailors, clearly perceived a raft covered with men towed by boats which were displaying signals of distress. Yet this was nothing more than a collective hallucination. Admiral Desfosses lowered a boat to go to the rescue of the wrecked sailors. On nearing the object sighted, the sailors and officers on board the boat saw “masses of men in motion, stretching out their hands, and heard the dull and confused noise of a great number of voices.” When the object was reached those in the boat found themselves simply and solely in the presence of a few branches of trees covered with leaves that had been swept out from the neighbouring coast. Before evidence so palpable the hallucination vanished.
The mechanism of a collective hallucination of the kind we have explained is clearly seen at work in this example. On the one hand we have a crowd in a state of expectant attention, on the other a suggestion made by the watch signalling a disabled vessel at sea, a suggestion which, by a process of contagion, was accepted by all those present, both officers and sailors.
It is not necessary that a crowd should be numerous for the faculty of seeing what is taking place before its eyes to be destroyed and for the real facts to be replaced by hallucinations unrelated to them. As soon as a few individuals are gathered together they constitute a crowd, and, though they should be distinguished men of learning, they assume all the characteristics of crowds with regard to matters outside their speciality. The faculty of observation and the critical spirit possessed by each of them individually at once disappears. An ingenious psychologist, Mr. Davey, supplies us with a very curious example in point, recently cited in the Annales des Sciences Psychiques, and deserving of relation here. Mr. Davey, having convoked a gathering of distinguished observers, among them one of the most prominent of English scientific men, Mr. Wallace, executed in their presence, and after having allowed them to examine the objects and to place seals where they wished, all the regulation spiritualistic phenomena, the materialisation of spirits, writing on slates, etc. Having subsequently obtained from these distinguished observers written reports admitting that the phenomena observed could only have been obtained by supernatural means, he revealed to them that they were the result of very simple tricks. “The most astonishing feature of Monsieur Davey’s investigation,” writes the author of this account, “is not the marvellousness of the tricks themselves, but the extreme weakness of the reports made with respect to them by the noninitiated witnesses. It is clear, then,” he says, “that witnesses even in number may give circumstantial relations which are completely erroneous, but whose result is that, if their descriptions are accepted as exact, the phenomena they describe are inexplicable by trickery. The methods invented by Mr. Davey were so simple that one is astonished that he should have had the
