INTELLIGENCE OE CEBTJS. 
497 
movements were unrestrained, and generally monkey-like ; 
but with her he was always as gentle as a kitten : he 
appeared to know that her age and infirmities rendered 
boisterousness on his part unacceptable. 
I returned the monkey to the Zoological Gardens at 
the end of February, and up to the time of his death in 
October 1881, he remembered me as well as the first day 
that he was sent back. I visited the monkey-house about 
once a month, and whenever I approached his cage he saw 
me with astonishing quickness — indeed, generally before 
I saw him — and ran to the bars, through which he thrust 
both hands with every expression of joy. He did not, 
however, scream aloud ; his mind seemed too much occu- 
pied by the cares of monkey-society to admit of a vacancy 
large enough for such very intense emotion as he used to 
experience in the calmer life that he lived before. Being 
much struck with the extreme rapidity of his discernment 
whenever I approached the cage, however many other 
persons might be standing round, I purposely visited the 
monkey-house on Easter Monday, in order to see whether 
he would pick me out of the solid mass of people who fill 
the place on that day. Although I could only obtain a 
place three or four rows back from the cage, and although 
I made no sound wherewith to attract his attention, he 
saw me almost immediately, and with a sudden intelligent 
look of recognition ran across the cage to greet me. 
When I went away he followed me, as he always did, to 
the extreme end of his cage, and stood there watching my 
departure as long as I remained in sight. 
In conclusion, I should say that much the most 
striking feature in the psychology of this animal, and the 
one which is least like anything met with in other animals, 
was the tireless spirit of investigation. The hours and 
hours of patient industry which this poor monkey has 
spent in ascertaining all that his monkey-intelligence 
could of the sundry unfamiliar objects that fell into his 
hands, might well read a lesson in carefulness to many a 
hasty observer. And the keen satisfaction which he dis- 
played when he had succeeded in making any little dis- 
covery, such as that of the mechanical principle of the 
