O. Riddle and J. A. Harris 167 



Jit this group is highly heterogeneous. It comprises birds, 

 wh h were still laying at the time the blood samples were taken 

 amthose which had ceased to lay. 14 Dividing the birds into two. 

 grcps on the basis of their laying activity at the time of sampling 

 weind the following values for averages, variabilities, and cor- 

 relions. 



]tr 54 birds which had ceased laying, 



/ = 0.199 e = 139.09 



&amp;lt;r f = 0.0847 a e = 38.948. 



Vf = 42.36 V e = 28.00 



r fe = -0.296 0.084 



],&amp;gt;r 16 birds which were still laying at the time the samples 

 we taken, 



/ = 1.103 s = 163.37 



&amp;lt;r f = 0.6102 ffe = 30.503 



F /= 55.30 V e = 18.67 



r fe = +0.351 0.147 



He-,/ = percentage fat, e = number of eggs laid during the year, 

 thoars over these letters denote the averages, the sigmas their 

 abdute variabilities in terms of square root of mean square 

 delation from their mean, V their coefficients of variation, i.e., 

 10(/ mean, and r the correlation between them. 



bw while the probable errors of these correlations are large, 

 becuse of the relatively few determinations, the correlations 

 sugest at once that while the birds are laying those which have 

 thehighest percentages of blood fat are those which make the 

 higsst egg records, but that after the bird has ceased laying in the 

 autnm those which have laid the greatest number of eggs during 

 theear have the blood most depleted of fat; or, at any rate, have 

 bloi with least fat. 



fcpport for this view is furnished by splitting the birds up into 

 twcgroups according to the color of the beak, legs,- and vent 

 a caracter which when taken in October may be taken as a 

 critrion of annual egg production. 5 



14| ne bird had not laid at all during the year. 



&quot;ilakeslee and Warner, as cited by Warner and Edmonds. See also 

 Hais, Blakeslee, and Warner, Genetics. 1917, ii, 36; Proc. Nat. Acad. Sc., 



N iii, 237. Blakeslee, Harris, Warner, and Kirkpatrick, Storrs Agric* 

 fxiStation, Bull. 92, 1917. 



