No. 4.] BIRDS AS PROTECTORS OF ORCHARDS. 351 



I take the following from Mr. Bailey's notes : — 



Number of Eggs of the Fall Canker-worm found in Stomachs of Chick- 

 adees. 



No. 1 273 eggs. 



"2, 261 " 



"3, 216 " 



"4, 278 " • 



Making in all 1,028 e^irs found in the stomachs of four 

 birds. Four birds killed later in the season had eaten the 

 female imagoes of the spring canker- worm (Paleacrita ver- 

 natd) as follows: — 



No. 1, 41 moths. 



"2 18 " 



"3, 27 " 



"4, 19 " 



Making a total of 105. In Xos. 2, 3 and 4 of the last table 

 there were a large number of eggs also. It is safe to say 

 that there were 150 eggs in each stomach, in addition to the 

 female moths eaten. 



Mr. Bailey carefully counted the eggs in the ovaries of 

 twenty of these female moths, with the following results : — 



158 

 272 

 127 

 184 

 213 

 135 

 140 

 220 

 200 

 130 



111 



160 

 193 

 131 

 281 

 242 

 116 

 281 

 192 

 217 



It will be seen from this table that the average number of 

 eggs found in each moth is 185. Mr. Bailey is very posi- 

 tive, from his continuous field observations, that each chick- 

 adee will devour on the average 30 female canker- worm 

 moths per day from the 20th of March until the 15th of 

 April, provided these insects are plentiful. If the average 

 number of eggs laid by each female is 185, one chickadee 



