56 THE TREND OF THE RACE 
into Human Faculty). One case of two twin brothers reported by 
Dr. Moreau is sufficiently striking to deserve quotation: “ Physi- 
cally the two young men are so nearly alike that the.one is 
easily mistaken for the other. Morally, their resemblance is no 
less complete and is most remarkable in its details. Thus, their 
dominant ideas are absolutely the same. They both consider 
themselves subject to imaginary persecutions; the same enemies 
have sworn their destruction, and employ the same means to 
effect it. Both have hallucinations of hearing. They are both of 
them melancholy and morose; they never address a word to any- 
body, and will hardly answer the questions that others address to 
them. They always keep apart, and never communicate with one 
another. An extremely curious fact which has frequently been 
noted by the superintendents of their section of the hospital and 
myself is this: From time to time, at very irregular intervals of 
two, three, and many months, without appreciable cause, and by 
the purely spontaneous effect of their illness, a very marked 
change takes place in the condition of the two brothers. Both of 
them, at the same time, and often on the same day, rouse them- 
selves from their habitual stupor and prostration; they make the 
same complaints, and they come of their own accord to the physi- 
cian, with an urgent request to be liberated. I have seen this 
strange thing occur, even when they were some miles apart, the 
one being at Bicétre, and the other living at Saint-Anne.”! 
According to Schlub three-fourths of the cases of insanity 
occurring in siblings is of the same type. The percentages of like 
1 Bajenoff (Quelques réflections sur les folies gémellaires et familiales, Arch. 
internat. de Neur., 11, s. I. 213-218, 1913), cites a number of cases of similar in- 
sanity in twins; in one case reported by Harandon de Montyel two twin girls, 
apparently identical, were married on the same day and became pregnant at about 
the same time. Both were taken with delirium in early pregnancy and were con- 
fined separately in the same asylum without either being apprised of the condition 
of the other. Their insanities were pronounced ‘absolutely identical”; their 
hallucinations were much the same and their spells occurred at the same time. 
They were delivered within 48 hours of each other and soon afterward the insanity 
in both subsided. Schultes (Ueber Zwillingspsychosen, Allg. Zeit. f. Psychiat., 1913, 
348-364), reports on five cases of insanity in twins; four of these which were very 
similar twins showed the same types of insanity. 
