1908.] Theory of Ancestral Contributions in Heredity. 71 



(b) That the recessive character which reappears in F 5 is as pure as that borne 

 by a pure race, as tested by the results obtained from its union with a pure 

 dominant character. 



(c) That there is nothing like Ancestral Contributions within the limits 

 of a single unit-character. 



(d) That in the attempt to predict the result of a given mating the somatic 

 characters not only of the parents and of the ancestors* of the individuals 

 mated, but of the individuals themselves,f may be entirely left out of account ; 

 and that the expectation based on a theory of the contents of the germ cells 

 of the two individuals mated is fulfilled. 



Synopsis of Contents of Tables and Summaries. 



Those tables (viz., II, VII, and VIII) which embody the result of the control 

 observations (see p. 70) are printed in italics. 



Page 



f Table I.— Matings between Pure Yellows and Extracted (F 5 ) Greens ... 72 



I Table II. — Matings between Pure Yellows and Pure Greens 73 



' Table III. — Particulars of F 2 Families from Crosses made between Pure 



Yellows and Extracted (F 5 ) Green No. 483 73 



Table IV.— Ditto. No. 484 75 



Table V.— Ditto. No. 485 76 



Table VI. — Ditto. Greens, not Classifiable by Yellow and Green Grand- 

 parents. (See p. 64) 77 



21 Summary of F„ Families from Crosses between Pure Yellows and Extracted 



" (F 6 ) Greens 78 



Table VII. — Particulars of F 2 Families from Control Crosses made in 1906 78 

 Table VIII. — Particulars of F 2 Families from Control Crosses made in 1907 

 between the Pure Yellow Types used in the Experiment 



and " Express," !a Pure Green (Round) Type 79 



Summary o/F 2 Families f rom Control Crosses (Tables VII and VIII) 79 



* See Pedigree B on p. 68. 

 t See Pedigree A on p. 68. 



