18 



THE SEED SUPPLY 



essential that the grower be located where the conditions of soil 

 and climate are especially favorable for the development of the 

 particular crop in question. The grower must have intimate 



Fig. 7. — Sectional views of the cabbage He^dS showiyWr^ig. ■j6*."'^^"ote the solidity of the 

 head at the right p a food seedlype. m 



\ :!' 

 knowledge of all the features thai. §o io make up the most desirable 

 type of the variety with w^hic^. %p hjas to deal. .. This is essential 

 to the proper selection of seed J)lai.pts aFtlle start (Figs. 6 and 7), 

 and the discarding of undesirdfcle plkntg^rom the growing crop. 



YiG. 8. — The result of five years' selection for thickness of flesh in muskmelons. 



The pulling out of plants untrue to type in a growing seed crop 

 is known as ''roguing." All vegetable crops grown for seed should 

 be very carefully ''rogued." Almost any variety of vegetable 

 can be improved by a careful selection of seed plants year after 



