SEEDS AND SEED-GROWTH. 9 



ing, when the surface soil is moist, we have planted black 

 walnuts, butternuts, hickory-nuts, chestnuts, and oak 

 acorns by merely crowding them down in mellow soil with 



Fig. 1. 

 Plaktlet op Plantlbt of Plantlbt of Plantlbt of 



Pttmpkin. Bean. Indian Corn. Pea. 



In the pumpkin and bean, the seed-leaves (cotyledons) are lifted 



above the surface of the soil in germination. 

 In the corn and pea, the cotyledons are not lifted above the surface 

 of the soil in germination. (After Goff.) 



the boot-heel, with a success never attained in planting 

 over one inch deep. ' 



10. Best Time to Plant. — As previoiisly stated, stratified 

 seeds kept in open air or the cellar must be planted very- 

 early or they may sprout in the boxes. But aside from 

 this the fruit-tree seeds germinate at a low temperature 

 and succeed best when planted quite as early as seeds of 

 such cold-blooded plants as the pea, lettuce, and radish. 

 But the temperature of our northern summers — especially 

 west of the lakes — permit the growing of many sub- 

 tropical annuals, such as corn, bean, melon, cucumber. 



