Fig. 8. The various tvpes of leaves from progeny of a single hybrid black- 
berry plant. After de Vries. 
Fig. 9. Breeding disease-resistant asparagus at the U S. Asparagus Experi- 
ment Station at Concord, Mass. On the right are disease-resistant plants, while 
those on the left are about half destroyed by disease. After Norton. 
