MENDEL'S LAW 21 



able. He knew that if he crossed certain plants he would 

 reap certain results, and that in the second generation the 

 seedlings would show a splitting up into varieties, and he 

 was able to state beforehand what proportion these variations 

 would have to each other, and to affirm that some types 

 known as "recessives" would be constant. As far as the 

 Mendelian laws in relation to Sweet Peas are concerned, 

 Alexander Malcolm claims to have proved that they do 

 apply. He is a most painstaking, skilful, and experienced 

 worker, and the results which he has achieved have more 

 than satisfied him that he is proceeding on the right lines. 



The theory is elaborate and it demands thorough study. 

 Those who would enter upon it should consult Professor 

 Bateson's Mendel's Principles of Heredity, which is published 

 by the Cambridge University Press ; or the same author's 

 Methods and Scope of Genetics. Mr. Cuthbertson contributed 

 some information on the subject in the Sweet Pea Annual 

 for 1909 ; and an excellent article, with a coloured plate, 

 appeared in the Gardeners' Chronicle for July 24, 1909. 



