J. R. Learmonth 145 



of the same group from solution by any other serum." It is also found 

 that agglutination always precedes haemolysis. 



3. Recording of results. This is done upon slips prepared as shown 

 below. 



Index No. of Family 



Father: Group 



Mother : 

 C 



c 

 c 

 c 



C: 



c 



M = Male, F = Female, child. 



Statistics. 



The data given in Table I (p. 146) are compiled from a series of forty 

 families, taken at random. 



Analysis of Families. 



To facilitate an analysis of these 40 families they have been arranged 

 under the ten possible forms of mating in Table II (p. 147). Three of these 

 forms, viz. I x I, I x III, and III x III are not represented in the data. 

 Since there is no indication of sex-linked inheritance no distinction has 

 been made between the sexes of the offspring in Table II, but their 

 total numbers have been allocated to the respective groups to which 

 they belong. Reciprocal matings also are here grouped together. 



With a single exception, noted below, the facts are clearly in 

 accordance with the explanation already outlined in terms of the two 

 factors A and B. The following comments on the Table may be given 

 in connection with certain of the types of mating. 



(6) This form of mating might give rise to many different results 

 according as to whether the Group I parent were of the constitution 

 AABB, AaBB, AABb, or AaBb, and the Group II parent AAbb or 

 Aabb. Theoretically offspring of all four classes could arise from this 

 form of mating if the parents wore AaBb and Aabb. This of course 

 also is true of (c). 



