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244 A. D. Darbishire. 
individuals are written to the right of the cireles, whilst their 
zygotic constitutions are written inside them. 1 
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PEDIGREE A. 
PEDIGREE B. 
The difference between cross a and b in pedigree A and a and b 
in pedigree B is that whilst in pedigree A the two zygotes crossed 
actually bear the D and R characters respectively, in pedigree B 
both zygotes bear the D character. 
After this digression into that part of Mendelian theory which 
is common to it and to Weismann’s and to all “germinal” 
theories of inheritance, let us turn to the consideration of the 
new ideas for the introduction of which Mendel is solely responsible. 
But, before we do so, let me insist for the last time on the importance 
of carefully discriminating in what is called Mendelian theory 
between those sections of it which are common to Weismann’s, and 
indeed to the whole modern conception of inheritance, and those 
sections to which alone the title Mendelian should be applied. 
1 The details of this experiment will be found in Proc. Roy. Soc. 
B., Vol. 81, p. 70. 
