no MENDEL: 



" recessive." Let us again allow the tails and dwarfs 

 thus obtained to be self-fertilized, and a remark- 

 able result follows. All the recessives (or dwarfs) 

 breed true, and, to make a long story short, it may 

 be added, will continue to breed true, that is, to 

 produce dwarf forms without any admixture of 

 the larger variety for any number of generations. 

 Such is not the case with the dominants. They, 

 when self-fertilized and sown, produce both tails 

 and dwarfs. Some of the tails will be pure, others 

 will not, for their offspring will give both varieties, 

 and the pure are to the impure on an average as 

 one to two. Hence, out of the first hundred plants, 

 seventy-five will be dominants, or, in this case, 

 tails, and twenty-five recessives or dwarfs. But the 

 latter will be pure and will go on, so long as they 

 are not crossed, producing dwarf specimens. Of 

 the seventy-five dominants twenty-five will be 

 pure dominants and will go on producing tails, 

 but fifty will be mixed, and their progeny will 

 consist again of pure dominants, mixed dominants 

 and recessives as above stated. 



The laws which underlie these observations 

 have been formulated by Professor Davenport,* 

 whose statement is here reproduced. 



" The two great laws enunciated by Mendel 

 were these : Of the two antagonistic peculiarities 

 possessed by two races that are crossed, the hybrid, 

 or mongrel, exhibits only one ; and it exhibits it 

 completely, so that the mongrel is not distinguish- 

 able as regards this character from one of the 



* Science, N.S. vol. xix, no. 472, pp. 110-114. 



