SIZE, SHAPE AND PHYSICAL CONSTITUTION OF THE EGG. II 5 



same environmental conditions since hatching and they began to 

 lay at very nearly the same time. Further there are only 

 slight differences in the degree and direction of variations in 

 the monthly means of the same weight character for the sev- 

 eral birds. 



The material has been brought together by calculating di- 

 rectly for each weight character the monthly mean of all the 

 eggs laid by the twelve birds. 



The means are given in Table 2. 



TABLE 2. 



Shozi'ing for Bach Month the Number of Birds Laying, the 

 Niimher of Eggs Laid and the Mean Egg Weight, Yolk 

 Weight, Albumen Weight and Shell Weight for the Tzvelve 

 Birds zi'hich Completed their Second. Year. 



Month. 



No. birds 

 laying. 



No. eggs 

 laid. 



Mean 



egg 



weight, 



gms. 



Mean 



yolk 



weight, 



gms. 



Mean 



albumen 



weight, 



gms. 



Mean 

 shell 



weight, 

 gms. 



Mean tem- 

 perature 

 in degrees, 

 F. 



1910 



October. . . 

 November. 

 December . 



1911 



January. . . 

 February, . 

 March 



April 



May 



June 



July 



August. . . . 

 September, 



October. . . 

 November. 

 December . 



1912 



January. . . 

 February. . 

 March 



April 



May 



June 



July 



August. . . , 

 September 

 October. . 



1 



12 

 11 



3 

 137 

 206 



48.56 

 47.48 

 48.99 



13.66 

 12.87 

 13.39 



28.13 

 29.11 

 30.38 



1 



6.17 

 5.461 



5.22 



12 

 10 

 12 



110 

 100 

 224 



50.37 

 53.53 

 54.25 



14.24 

 16.27 

 16.18 



30.88 

 30.94 

 32.46 



4.84 

 5.37 

 5.63 



12 



12 

 12 



210 

 192 



144 



54.42 

 53.73 

 53.66 



16.43 

 16.23 

 16.25 



32.48 

 32.12 

 32.23 



5.54 

 5.39 

 5.13 



11 

 11 

 11 



158 

 170 

 132 



52.22 

 54.75 

 55.44 



16.31 

 16.72 

 16.88 



30.83 

 32.53 

 33.13 



4.87 

 5.46 

 5.41 



9 



4 



4 



86 

 15 

 43 



56.68 

 58.51 

 59.20 



17.61 

 17.41 

 17.50 



33.23 

 35.57 

 35.93 



5. 55 

 5.43 



5.77 



5 

 1? 



29 



39 



179 



61.30 

 54.73 

 59.03 



17.90 



17.85 

 18.46 



37.72 

 31.88 

 34.71 



5.67 

 5.08 

 5.68 



12 

 12 

 11 



130 

 138 

 148 



56.12 

 55.63 

 58.10 



17.47 

 17.71 

 18.45 



33.10 

 33.47 

 34.30 



5.08 

 5.31 

 5.62 



12 



10 



11 



9 



137 

 88 



123 

 83 



56.97 

 57.16 

 58.46 

 61.64 



18.31 

 18.16 

 18.19 

 18.19 



33.46 

 33.61 

 34.69 

 37.20 



5.32 

 5.39 

 5.53 

 6.23 



48.40 

 34.95 

 19.55 



18.15 

 14.56 

 25.20 



40.90 

 59.25 

 62.30 



71.20 

 66.20 

 57.20 



46.10 

 34.40 

 28.00 



10.90 

 17.70 

 27.00 



43.50 

 57.10 

 63.80 



67.20 

 62.50 

 57.50 

 49.80 



