ceeds on the assumption that the characters acquired by 

 some of the plants on account of favorable environment are 

 inherited. The origin of the new forms is to be explained 

 probably on the assumption that the favorable conditions 

 allowed certain germinal characters to find expression. 



2. Rimpau's Method. — Plants are grown in a mass under 

 ordinary or unfavorable conditions and the best selected. 

 Rimpau believed that such a procedure revealed best the 

 heritable characters in the true genotype. When such se- 

 lection is practised year after year pure lines tend to be pro- 

 duced which, we have seen, are stable. 



3. DeVries' Method. — This method consists in the selec- 

 tion of desirable mutation forms that may arise in plant- 

 ings. 



4. Vilmorin's Method. — The improved sugar beet has 

 arisen by this method. The seeds of selected plants are 

 sown in separate plots, and at maturity one or more.'samples 

 of each plot is tested for sugar content. Seed is secured 

 from the plants of the plot that has given the best sample. 



5. Johannsen's Method. — Consists in the isolation of de- 

 sirable Pure Lines by planting individual seeds from super- 

 ior mother plants until stable pure lines are obtained. 



6. Burbank's Method. — where hybridization and selec- 

 tion are practised on a large scale, with the expectation that 



' new forms may arise through the "random result of fortuit- 

 ous combinations." 



7. Mendel's Method. — where hybridization is practised 

 with the expectation of getting the desired combination by 

 definite crosses. (See Mendelism). 



Registered Seed and Seed Centres in Canada. — A system 

 of selection and registration of seed exists in Canada under 

 the supervision of the Canadian Seed Growers' Association. 

 The grades leading up to "Registered Seed" are:— 



1, Hand Selected Seed, 

 2 Improved Seed, and 

 3. Elite Stock Seed. 



Hand Selected Seed is cleaned seed obtained from heads, 

 etc., which are uniform in character and which have been 

 selected by hand from sound, vigorous and normally de- 

 veloped plants. 



1.55 



