XIV INTERMEDIATES 167 



historical evidence to show that this is the case 

 in the Chinese Primula as well as in Primula 

 obconica. The large flower appeared suddenly, 

 and, as neither species is known to cross with 

 any outside form, it is unlikely to be the result of 

 any recombination of size factors. But there are 

 other species, such as the Daffodils, where hybridisa- 

 tion has been practised with much success. It is 

 not improbable that the gorgeous triumphs of the 

 modern raiser are often due to the aggregation into 

 a single plant of a greater number of size factors 

 than are to be found in any one of the wild or eairlier 

 cultivated forms. The Daffodils are promising 

 material for an investigation of this kind, and a 

 properly conducted set of experiments might be 

 expected to yield results of considerable scientific 

 value. 



