its utterance, by Dr. Johannsen, and his word 

 "biotype" 8 was immediately adopted in my 

 paper * on " The Composition of a Field of 

 Maize " 4 and made a part of the title of my 

 work on " Bursa lursa-pastoris and Bursa 

 Heegeri: Biotypes and Hybrids." 6 In view 

 of these facts there was no excuse for my 

 use of the word "genotype" in a taxonomic 

 sense. 



Dr. Jennings also calls attention to an im- 

 portant misuse of the expression " pure line," 

 and here I must again admit a certain amount 

 of guilt, as I was probably the first to include 

 under this term groups of individuals related 

 through the process of budding or any other 

 method of vegetative reproduction. In 1904 

 I wrote: 8 



By the "pure line" Johannsen means a series 

 of individuals related only through the process 

 of self-fertilization. On a priori grounds it seems 

 proper to apply the term to every series of indi- 

 viduals that do not combine elements of two or 

 more ancestral lines through the equivalent of a 

 sexual process. Thus, so far as hereditary quali- 

 ties are concerned, there should be no reason to 

 expect in a self-fertilizing population conditions 

 different from those in a population related 

 through budding or other method of vegetative 

 reproduction, provided, of course, that the self- 

 fertilizing population has not been so recently 

 modified by a cross as to allow the analysis and 



8 This word was first proposed in 1905 in 

 ' ' Arvelighedslaerens Elementer," the Danish fore- 

 runner of "Elemente der exakten Erblichkeits- 

 lehre, ' ' and was first used in English at the Third 

 International Conference on Genetics in 1906. 

 (See Eeport Third International Conference on 

 Genetics, p. 98, 1906.) 



Eeport American Breeders* Association, IV., 

 296-301, 1908. 



"Carnegie Institution of Washington Publica- 

 tion No. 112, 1909. 



*Torreya, V., 22, February, 1905. 



