W. F. R. Weldon 65 



that described by Mciiik'l iiiuy lic just ;is casily secn wheu the variations obsorved 

 both in parents and in otifspiing aii' clcarly described; when this has boeii dmie, 

 and not bcfore, \ve shall be able to consider seriously what the issues raised by 

 Mendel's statements really are. In the inean tiine the accuniulation of records, in 

 which residts are massed together in ili-detined categories of variable and uncertaiu 

 extent, ean <inly rrsuit in härm. 



The confusion introdnced by the use of such categories into the record of 

 expcriments on the spiny-fruited and smootii-friiitcd races oi Datara, performed by 

 Mr Bateson and Miss Saunders, is even greater than that we have examined ; but 

 I refrain from discussing it er other cases in detail, uutil 1 can illustrate the 

 categories by reference to a füll series of specimens. 



