46 
BULLETIN OF THE BUREAU OF FISHERIES 
admitted direct sunshine to most of the floor space during the greater part of the day. 
The animals were held in water-tight wooden boxes or tanks (a few metal tanks also 
were used) from 8 to 10 feet long and 20 to 24 inches broad. These tanks were 
divided into four or five compartments. Each tank was tilted to one side, and enough 
water was supplied to cover about half of the bottom of each compartment. This 
arrangement made it possible for the animals to enter the water or to stay out, 
according to choice. The house was heated by a stove. 
i 9 ii m m m m m m m ms ipso 1921 1922 m3 1924 ms issg mi 
Figure 2. — Rate of growth of two unselected lots of the brood of 1911. Line F represents a lot that was fed the first three 
winters, and line H represents a lot that hibernated each winter. No males were present in either lot 
Generally, young animals were placed in the brooder house in October, ana an 
effort was made to keep the temperature at or above 80° F. in so far as possible with 
such an inefficient heating plant as a stove. Under these conditions terrapins remain 
active all winter. 
Recently hatched young, only, were winter fed, except a lot of the 1910 and 
another of the 1911 brood, which were fed, respectively, two and three winters. 
The gain in growth during the winter of terrapins that were over a year old was so 
small that winter feeding of all except the recently hatched young was abandoned 
because it appeared to be impracticable. 
