NAUDIN 171 
character of one species (A), whilst others will bear 
no potential resemblance to A, but will be precisely 
similar in nature to the ovules and pollen grains of 
the pure species B. In cases where this separation of 
the materials representing the two types in a potential 
condition is complete, forms exactly resembling the 
parents might be obtained. As we shall see, this 
hypothesis makes a remarkably near approach to that 
of Mendel ; and the importance of the fact that the 
first hybrid generation is generally uniform, as con- 
trasted with the diversity of types often appearing 
in the second generation, is clearly recognised by 
Naudin. This observer considered the hybrid in the 
adult state to consist of an aggregate of particles, 
homogeneous and characteristic of a single species 
when taken separately, but mingled in various pro- 
portions in the organs of the hybrid, which is thus 
looked upon as a kind of living mosaic. 
The only other discovery of first-class importance,* 
in addition to that of Mendel, made during the nine- 
teenth century in the domain of hybridization, was 
that published by Millardet in 1894. 
Millardet’s principal experiments were made upon 
strawberries, of which plants he crossed together a 
number of different species and varieties. Contrary 
to what had been observed in the majority of such 
crosses between other specles of plants, in which the 
offspring was usually more or less intermediate be- 
tween the two parents from which it arose, Millardet 
* That is to say, if it is really genuine. The phenomena 
do not appear to have been seen by anyone else. 
