go THE EVOLUTION OF LIVING BEINGS. 



planting a single individual of Antirrhinum glutino- 

 sum in an experimentgarden, in which a large number 

 of different types of Antirrhinum are cultivated. 



As Antirrhinum glutinosum is selfsterile, we can 

 observe the result at once in Fj. 



Now the result.obtained in such a case in Bennebroek, 

 was an enormunsly varied Fi which could be explained, 

 either by the fact, that the individual of A. glutino- 

 sum had been crossf ertiUzed by a number of different 

 Antirrhinum-types, the poUen of which had been car- 

 ried by bumblebees to the different flowers of the glu- 

 tinosum-individual, or by a single, but highly hetero- 

 zygous, type. 



A priori, the former was the most probable but this 

 single experiment was insufficient to settle what had 

 really happened. 



To settle this point, several individuals of A-glutino- 

 sum were planted out and seeds of one of them collected. 



The result was the same: a multiform F^, but 

 this time there were pure glutinosum-forms among 

 this Fi, which failed to appear in the first one. 



It was thus proved that A. glutinosum was f ertiUsed 

 at least by two of the different types present in the 

 garden viz by A. glutinosum and by at least one hetero- 

 zygous tj^pe of A. majus, much more probably by 

 several t57pes, the pollen of which had been brought to 

 the glutinosum plant by insects. 



This experiment is yet in progress with the overwin- 

 tered Fi plants which of course will continue to cross 

 with one another and with other tj^es present in the 

 garden, thus giving continuously rise tonewtj^ies. 



