165. Simpson — Proc. Royal Soc. Edinburgh, Vol. XXXII, 

 part 1, No. 5, p. 19. 



166. Simpson — Proc. Royal Soc. Edinburgh,, Vol. XXXII, 

 part 1, No. 11, p. 10. 



167. Simpson and Galbraith — Jour. Physiology, Vol. 83, 

 p. 225. 



168. Crisp, E.— Proc. Brit. Soc. Adv. Sci., 1864 and 1865, 

 p. 92. 



169. Wilbur, A. P., and Watts, E. A. — Personal communi- 

 cation. 



170. Post, K. C— Wilson Bull., Dec, 1916, p. 178. 



171. Wetmore, Alex. — U. S. Dept. Agric. Farmers Bull., 

 No. 770, p. 16. 



172. Sherman, A. R.— Wilson Bull., Dec, 1916, p. 196. 



173. Spohn and Riddle — ^Am. Jour. Physiology, Vol. XLI, 

 No. 3, p. 408.- 



174. Buchanan — Jour. Physiology (Cambridge), Vol. 

 XXXVIII, 1909, p. 62-66."" 



175. Colo. Mus. Nat. Hist., F. C. Lincoln — Personal com- 

 munication. 



176. Evans— Birds, 1898. 



177. Oberholser— U. S. Nat. Mus. Bull. 86. 



178. Mever— Auk, 1916, p. 82. 



179. Hitchcock— Bird-Lore, March-April, 1917, p. 79. 



180. Eaton— Birds of New York. 



181. Lanning— Wild Life in China, 1911. 



182. Colo. Mus. Nat. Hist., R. J. Niedrach — Personal com- 

 munication. 



183. Wilbur— Youth's Companion, Feb. 22, 1917, p. 111. 



184. Day— Bird-Lore, June, 1899, p. 78. 



185. Lucas— Auk, Vol. IV, p. 2. 



186. Campbell— Bird-Lore, Jan.-Feb., 1903, p. 5. 



187. Seton and Chapman — Bird-Lore, Jan.-Feb., 1904, p. 1. 



188. Lemmon— Bird-Lore, May- June, 1901, p. 108. 



189. Whitten— Bird-Lore, May-June, 1902, p. 95. 



190. Lemmon — Bird-Lore, Mav-June, 1904, p. 89. 



191. Campbell— Bird-Lore, Ja"n.-Feb., 1903, p. 5. 



192. Jackson— Bird-Lore, Nov.-Dec, 1903, p. 184. 



193. Moore— Bird-Lore, Sept.-Oct., 1902, p. 162. 



194. Hegner— Bird-Lore, Sept.-Oct., 1906, p. 154. 



195. Shufeldt— Auk, July, 1893, p. 304. 



196. Heil— Bird-Lore, May-June, 1908, p. 101. 



197. Heil— Bird-Lore, July-Aug., 1909, p. 158. 



ERRATUM— 



Pages 52 to 57, inclusive — Read "Temperature" for "Weight" 

 at heads of second columns. 



