224 BACKBONED ANIMALS. 
In the breeding-season the female utters a bark like a 
dog. The eggs, somewhat resembling those of a goose, 
are deposited among leaves in heaps, and when hatched 
the young are led away by the mother and fed upon 
masticated food. The India crocodiles in the dry sea- 
son hibernate in the mud, which hardens about them. 
A tent pitched unwittingly over such a case was once 
overthrown by the awakening hibernator. Allied are 
the long-nosed crocodiles (Gavialide), three species of 
which are known, inhabiting the Ganges and rivers of 
Borneo and North Africa. They attain a length of thirty 
feet. 
VaLuEe.—The teeth, flesh, hide, and oil, are all valued. 
Specimens for Study.—In the spring months the eggs of 
frogs and toads can be found in pools, and should be 
placed in an aquarium or some vessel, and the changes 
watched from day to day. In this way the history of the 
animal can be followed from the egg to the adult, and the 
habits, etc., observed. Eggs hardened in alcohol can be 
cut into sections and examined. The simple skeleton of 
the frog or toad affords an excellent object for study, and 
should be prepared, the bones labeled and compared with 
those of allied and higher forms, and the points of differ- 
ence noted. Collections of the fauna of a neighborhood 
or country are always valuable, and should comprise the 
eggs, tadpoles in all stages up to the adult, preserved in 
alcohol, and marked with locality, name, sex, etc. A book 
of reference should also be kept, in which notes, observa- 
tions, and sketches should be entered. 
and dispatched. A smaller specimen, that was taken into the boat and 
supposed to be dead, suddenly recovered, upsetting it, and throwing 
the occupants into the water. The animals are extremely wily, and 
capture birds by jerking them under water by the legs ; and, to show 
their marine habits, specimens have been seen on the reef four miles 
from land. : 
