n8 MENDEL: 



entirely free from rust ; and the numbers of the 

 two kinds of plants were as follows : 1,609 infected, 

 523 immune. It is clear, then, that immunity and 

 susceptibility to the attacks of yellow rust behave 

 as a simple pair of Mendelian characters, immunity 

 being recessive. And it is, therefore, possible to 

 obtain by crossing, in three generations, a pure 

 rust-free strain containing any other desired 

 quality which is similarly capable of definite in- 

 heritance." 



If these observations, as certainly seems likely, 

 come to be ultimately established beyond cavil, 

 the Augustinian abbot's observations in his monas- 

 tery garden will have had for their result the saving 

 of vast sums annually for the agriculturists of all 

 countries. 



In speaking of the Blue Andalusians mention 

 was made of the fact that to some extent they 

 departed from the original Mendelian laws, in 

 that a new form not represented by either of the 

 parents was produced, and it was suggested that 

 some explanation of this point was probably 

 attainable. Some indication of how this will be 

 arrived at may be gleaned from experiments which 

 have been made with red and cream-coloured 

 stocks and other flowers. Bateson describes these 

 experiments and says : 



" The red variety is characterized by red sap, 

 the cream variety is characterized by yellow 

 corpuscles, surrounded by colourless sap. In the 

 red those corpuscles are represented by colourless 

 corpuscles floating in the red sap. What will 



