ITS HISTORY AND DEVELOPMENT 83 



separately. Owing to the method of pollination, it 

 was impossible to determine what proportion of the 

 seed-balls of the pollinated plants were single. Of 

 the other plants, the highest, or number 51, yielded 25 

 per cent, single-germ balls and the next 10 averaged 

 17 per cent, singles. 



In 1905 the best plant yielded slightly over 50 per 

 cent, singles, two plants yielded between 49 and 50 

 per cent., several exceeded 40 per cent, and many ex- 

 ceeded 30 per cent. 



The third generation yielded about the same as the 

 second. In the fourth generation some of the plants 

 yielded 60 to 70 per cent, singles, two produced as high 

 as 80 per cent, and one produced 85 per cent, singles. 

 The very high plants proved to be weaklings and 

 eventually died without producing further results. 



The work was interrupted during 1913 and 1914, but 

 fortunately, samples of nearly all the seed which had 

 shown promising results in 1912 have been saved. 

 The best plants with which the Department now is 

 working yielded 60 to 70 per cent, singles. 



In addition to the production of single-germ plants, 

 the Department is conducting with this experiment 

 a number of investigations in regard to weight and 

 quality of seed, as well as in regard to the quality 



