21 
The Brown Capucin {Cebus fatuellus), the Weeper Ca- 
puciN (^Cebus capucinus), and the White-throated Capucin 
{Cebus hypoleucus), are all small Monkeys of the kind usually 
trained for circus performances and organ-grinders. These, 
with the Squirrel Monkey {Saimaris sciurea), all belong to 
the family CebidcR. 
The Common Marmoset {Hapale jacchus), the Black- 
eared Marmoset {Hapale pencillatci) , and the Pinche {Mi- 
das cedipus), are small and beautiful Monkeys from the hottest 
parts of tropical America. 
The Monkeys of the New World range from about fifteen 
degrees north to forty degrees south latitude ; the most north- 
ern point which they reach in the eastern hemisphere being 
in Tunis, about thirty-eight degrees north latitude. 
Leaving the Monkey House, the visitor passes the old man- 
sion, “Solitude,” erected in 1785 by John Penn, a descend- 
ant of the founder of the Commonwealth, and now occupied 
by the offices of the Society — and descending a flight of steps 
turns to the left by 
No. 4.— THE BEAVER POND. 
The identity of the Beaver of North America with that of 
Europe has been for many years a subject of discussion 
among naturalists, and by a large number their specific dis- 
tinction is considered as assured. Recent researches, how- 
ever, embracing the comparison of a large number of skulls, 
place beyond dispute the fact that the cranial characters, 
which were taken to warrant the separation of the two forms, 
are subject to so great an amount of variation in different in- 
dividuals that they cannot be considered as binding. It 
seems proper, therefore, that the American form should be 
looked on merely as a variety of that from the Old World. 
The American Beaver {Castor fiber var. canadensis~)^ has 
been so valuable in times past to commerce, that a consider- 
able amount of interest has been felt in the organization of 
their villages, which are said to manifest a degree of system 
almost beyond anything else to be found among the lower 
animals. 
