io8 



SMITHSONIAN MISCELLANEOUS COLLECTIONS 



[vol. 45: 



On June 19 an examination of another colony was made, the re- 

 sults of which are tabulated as follows : 



Total nests examined 136 



" young birds (123 in nests, 170 in branches), 293. 

 Note. — Nests numbered 137 to 177 were not examined, but if we allow the 

 same average number of young to these forty-one nests, this colony should 

 have produced 395 young in 1902. ,. 



There are still many unsolved problems about bird life, among 

 which are the age that birds attain, the exact time at which some birds 

 acquire their adult dress, and the changes which occur in this with 

 years. Little, too, is known about the laws and routes of bird migra- 

 tion, and much less of the final disposition of the untold thousands 

 which are annually produced. 



