TIMI'I RATURES IX TURTLES. 445 



time, (30 minutes or more). At 80 decrees and above, animals 

 show marked in< rt/ased activity: signs of discomfort with rapid 

 n--piration; a frothing about the mouth and an accumulation 

 f moisture upon the head and about the eyes. 



4. In the absence of concrete data on comparative metabolic 

 ruu- at difk-rt-nt temperatures, these facts are tentatively inter- 

 pn-inl to mean that there is in turtles a slight tendency to 

 comprn-au- for < Tit ir.tl temperature changes in their environment. 



BIBLIOGRAPHY. 



1. Walbaum, Job. J. 



'40 .. I.ubcck. 1782 (citation from M. Dutrochet. Annals des 



. 1840. 13. 19). 



2. Milne-Edwards. H. 



'63 I ^ie et I'Anatomic Comparcc 8. 8-10. 



3. Czermak. J. J. 



'21 3. 385. 



4. Murray, John. 



"63 <*. 1836. 89 (citation from Milne-Edwards. 1863). 



5. Tiedemann, F. 



'30 Ti.iit..- dc PliyMuloKic. II.. 506. 

 . Davy, J. 



'39 . al and Anatomical. I.. 188-189. 



Valenciennes, A. 

 '41 . .id. ! 



sdater. P. L. 



'62 I 1 : . :. Soc. London. 365-368. 

 9. Forbes, W. 



'81 I Soc. London. 960-967. 



Martin, C. J. 



'03 I 1 ; :is. Roy. Soc. London. 1-37. 



1 1. Rogers, Chas. G., and Lewis, Elsie M. 

 '16 I 1 .;. : Hi LL.. 31, I-I5- 



