IN RATS AND GUINEA-PIGS. 



47 



Tabids 26 — Constants for the four groups of series D, based upon tables 6, 8, 10, 



and 12, respectively. 



Average number of spots borne 

 by a parent 



Average number of spots borne 

 by offspring 



Per cent increase over parents .... 



Standard deviation {a) in num- 

 ber of spots, parents 



Standard deviation (a) in num- 

 ber of spots, offspring 



Coefficient of variability, par- 

 ents 



Coefficient of variability, off- 

 spring 



Coefficient of correlation be- 

 tween parents and offspring. . 



Group DJ. 



378 

 4.76 



26 



2.S76 



3503 

 76.78 

 72.92 



0.4527 



Group Di. 



4.40 



5-44 

 24 



3.812 

 3-615 



85-32 



67.79 

 0.4580 



Group Dz. 



4 62 



5-S6 

 20 



3-744 

 3-663 

 80.90 



65-79 

 04278 



Group D3. 



4.64 



23 

 3694 

 3662 



7944 

 64.20 



0-4343 



Table 27. — Constants for tlie four groups of individuals of series H, based upon 

 tables 16, iS, 20, and 22, respectively. 



Average number of spots borne 

 by a parent 



Average number of spots borne 

 by offspring 



Per cent increase over parents .... 



Standard deviation («■) in num- 

 ber of spots, parents 



Standard deviation (a-) in num- 

 ber of spots, offspring 



Coefficient of variability, par- 

 ents 



Coefficient of variability, off- 

 spring 



Coefficient of correlation be- 

 tween parents and offspring 



Group H^. 



2.48 



3-88 

 56 



2.870 



3-576S 



"5-72 



92. iS 



0-4565 



Group Hi, 



1-56 



3.20 

 105 



2.922 



3.6076 



IS6.S7 

 112.75 

 0.6076 



Group H.'. 



1.80 



3.08 

 71 



3.I9S 

 3-S960 



177.66 



115.00 



o 6109 



Group II3. 



300 



SO 



3-434 

 3.6200 



171.70 



120.60 

 o 6796 



Table 28. — Character of the young of the original nose-spot male, /gSpa (iVi'o). 



