ON THE HYBERNATION OF THE DORMOUSE. 



163 



following observations : at a temperature of + 3° Keaumur a 

 slight whistling sound might be heard from both of them. 

 Male. 



Weighed on Sept. 2, 1879, 30 gr. 



Sept. 23, „ 43 gr. 

 Fell asleep on Sept. 23, 1879. 

 Weighed on Oct. 19, 1879, 39 gr. 



Nov. 4, ., 38 gr. 



Nov. 29, „ 35 gr. 



Dec. 28, „ 33 gr. 



Jan. 3], 1880, 34 gr. 

 A few days later he lay dead in the 

 nest. 



Female. 

 Weighed on Sept. 2, 1879, 25 gr. 

 Sept. 23, „ 35 gr. 

 Fell asleep on Sept. 23, 1879. 

 Weighed on Oct. 19, 1879, 33 gr. 

 Nov. 4, „ 32 gr. 

 Nov. 29, „ 31 gr. ; 

 temperature — 7° R. 

 Weighed on Dee. 28 „ 29 gr. ; 



temperature — 16° R. 

 Weighed on Jan. 31, 1880, 27 gr. ; 



temperature — 10° R. 

 On February 7th I counted twenty 

 respirations to the minute. 



Female. 



Weighed on Feb. 29, 1880, 26 gr. 

 Mar. 27, „ 24 gr. 



Awoke on April 15th, evacuated, ate, 

 and came outside its nest in the 

 morning, having thus slept unin- 

 terruptedly for 6 months 23 davs. 



Weighed on May 1 , 1880, 2U gr. 



27 gr. 



2K 



gr. 



May 29, 



„ July 3, 



» July 31, 



„ Sept. 5, 



Fell asleep Sept. 21, 



Weighed on Oct. 2, 



Oct. 31, 



Nov. 27, 



Dec. 23, 



Was lively on Dec. 31st, but did not 



eat anything. 



24 

 26 gr. 



24 gr. 



37 gr. 

 35 gr. 

 33 gr. 

 32 gr. 



Weighed on Jan. 29, 1881, 30 gr. 

 „ Feb. 26, „ 29 gr. 

 „ Mar. 27, „ 26 gr. 

 Awoke on April 9th, evacuated, and 

 ate, having slept for 6 months 

 19 days, with one single inter- 

 ruption on Dec. 3lst. 

 Weighed on April 30, 1881, 25 gr. 

 July 2, 

 July 30, 

 Aug. 27, 

 Fell asleep Sept. 24, 

 Weighed on Oct. 1, „ 37 gr. 

 Oct. 29, „ 34 gr. 

 Nov. 26, „ 33 gr. 



23 gr. 

 27 gr. 

 29gr. 



A male Dormouse which I received from London on Sept. 

 2nd, 1881, weighed as follows :— On September 3rd, 21 gr. ; on 

 October 1st, 28 gr. ; on October 29th, 31 gr. : on November 26th, 

 30 gr.; fell asleep on the 15th of October, but his sleep was not 

 so unbroken as that of the female, for he awoke several times a 

 month, took food (though in smaller quantities than usual), and 

 evacuated. 



The variations in the weight of the female during the summer 

 months from May to September may have arisen from some 

 slight organic disturbance. I found no increase in weight during 

 hybernation, except in the case of the last-mentioned male from 



