762 
Journal of Agricultural Research 
Vol. XXXI, No. 8 
also from the disturbing conditions attending feeding and the care 
of the yards. In the hibernation cabin in many cases they went 
into hibernation in the nests provided for them in the cool under¬ 
ground boxes. In fact, these seemed so well adapted for them that 
in the summer of 1915 a squirrel in one of the adjoining yards took 
up his abode in one of these nests which he had succeeded in reaching 
through a defective partition. 
Those squirrels which had gone into hibernation in the earth of 
their respective small yards were dug out of their nests, weighed, 
and transferred to the nest boxes in the hibernation cabin. Here 
they were visited almost daily and their condition and weekly weight 
noted. 
The records of females Nos. 7 and 8 and of males Nos. 8 and 9 
are given here, showing the activities and inactivities as they oc- 
Fig. 1.—Hibernation cabin in winter. Sometimes, in the dead of winter, the cabins became all but 
covered with snow. Then were presented true conditions of hibernation. Body temperatures 
which time the squirrels were but little 
curred and giving the weights from time to time. Also the record 
of a Townsend squirrel is given as illustrative of some points not so 
well shown by the more timid Columbian. 
HIBERNATION RECORDS 
The hibernation records of female 8, showing her behavior during 
the winter, are given as follows: Female 8 was captured August 16, 
1911, while in wild aestivation. On that date she weighed 334 grams. 
On being placed in yard 11, she awoke from aestivation and remained 
awake until September 18. Meantime, on August 21, she began the 
construction of a den in the earth of the outer yard. On August 23 
she moved all of her nest from the box out into the newly constructed 
burrow in the outer yard. From September 18 to November 10 
she was allowed to remain in undisturbed hibernation. On Novem¬ 
ber 11 she was dug from her nest and placed in the box of yard 11. 
