Olive-backed Thrush at Summer Home. 



125 



Length of 



Wing. Bird 1. Bird 2. Bird 3. 



July 11 1-8 1-8 



July 12 5-32 5-32 1-8 



July 13 3-16 3-16 5-32 



July 14 3-8 3 8 3-16 



July 15 9-16 7-16 3-8 



July 16 3-4 11-16 9-16 



July 17 1 and 1-8 15-16 13-16 



July 18 1 and 7-16 1 and 5-16 1 and 1-8 



July 19 1 and 7-8 1 and 9-16 1 and 9-16 



July 20...... 2 and 3-16 2 1 and 15-16 



July 21 2 and 5-16 



Bird 4. 



1-8 



5-32 



3-16 



5-10 



5-8 



13-16 



1 and 1-8 



1 and 11-16 



Weight 

 July 11. 

 July 12. 

 July 13. 

 July 14. 

 July 15. 

 July 16. 

 July 17. 

 July 18. 

 July 19. 

 July 20. 

 July 21. 



Birdl 



70 grains 



86 and 1-2 grains 



125 grains 



210 and 1-2 grains 



273 grains 



320 and 1-2 grains 



349 and 1-2 grains 



364 and 1-2 grains 



292 and 1-4 grains 



390 and 1-4 grains 



Bird 2 

 60 grains 

 70 grains 

 99 and 1-2 grains 

 180 grains 

 258 grains 

 310 and 1-2 grains 

 358 and 1-2 grains 

 401 and 1-2 grains 

 418 and 3-4 grains 

 422 and 1-4 grains 

 445 and 1-4 grains 



Birds 



46 and 1-2 grains 



84 and 1-2 grains 



133 grains 



206 grains 



258 grains 



305 grains 



375 grains 



418 and 3-4 grains 



420 and 1-4 grains 



Birds limp, prostrate in the nest, 

 a tint of burnt-orange, natal down 

 one-half inch long. 



A swollen, powder-colored band ex- 

 tends across the wings, and down the 

 upper part of the spine. 



Eyes beginning to open. 



Tips of quills extend beyond the 

 wings. Dark pores on head ; a few 

 enlarged pores on the underparts and 

 rump, a dark, swollen band down the 

 spine, across the coccyx and wings. 



AJll the feather tracts well indi- 

 cated. 



Quills across the coccyx. 



Birds well covered with quills and 

 pin feathers. 



Quills look light at the tip as they 

 do just before the feathers begin to 

 protrude. 



Birds make the preening motion. 



Feathers begin to appear. Birds 

 preen. 



Bird 4 



60 grains 



91 grains 



169 and 1-2 grs, 



205 grains 



285 grains 



343 grains 



418 and 3-4 grs. 



440 and 1-4 grs. 



Considerably 

 more than 445 

 and 1-4 grs. 



All the Nestlings. 

 Beginning of the first day. 



End of the first day. 

 End of second day. 



End of third day. 



End of fourth day. 



End of the fifth day. 



End of the sixth day. 



End of seventh day. 



