BY H. S. HALCRO WARDLAW, 



251 



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The above series of observations was made, as will be seen, 

 during two periods of the year. The first period extended from 

 April 30th to August 13th, 1914, 105 days, and comprised the 

 end of Autumn and the greater part of Winter. The second 

 period extended from September 22nd to December 2l6t, 1914, 

 90 days, and comprised the greater part of Spring and the 

 beginning of Summer. For the first series of observations. 

 Echidnas Nos. 1, 2, 3, 4, 5, 6, and 7 were used; for the second 

 series, Nos.6, 8, 9, and 10. 



As the behaviour of the animals, with regard to their temper- 

 ature, was considerably different in the winter-portion of the first 

 period from that in the autumn-portion of it, and in the second 



