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J. ARTHUR HARRIS 
process of combination of materials from individuals differentiated 
with respect of the number of abnormal rays which they produce. 
Table III shows the distribution of number of abnormal rays per 
inflorescence in groups of inflorescences of similar numbers of total 
rays in ;the'"data for 1909. In this table are included wholly normal 
inflorescences, all of which are entered in the zero class, as well as the 
inflorescences which contain abnormalities. Whenever the countings 
are sufficiently numerous to justify conclusions,, the frequency distri- 
