CHARACTERISTICS OF SOILS 9 



seeds in the jar marked 55 would germinate. If the seed 

 used in all the jars were of inferior quality, undoubtedly 

 a smaller percentage of them would germinate in jar 

 marked 55, than germinated in either of the other jars. 

 It is more than probable that in their later growth, these 

 corn plants would never overtake the plants in jar marked 



FIG. 2. Effects of temperature on germination. The jars have indi- 

 cated upon their sides the temperatures 55, 70, and 85 respec- 

 tively at which the jars were kept after the corn was planted in 

 them. The picture was taken 8 days after planting. 



85, and would never show the vigor and healthfulness 

 of the plants in that jar. It is also probable that the 

 plants resulting from the germinations occurring at 70 

 would never fully overtake the plants resulting from the 

 germinations at 85, or show the same vigor. 



13. A rare case. Some years ago, in southern Wis- 

 consin, a field unusually well prepared, in a season of 

 very favorable temperature conditions, was planted to 

 corn. In three days the young corn plants were above 

 ground sufficiently to be easily " rowed " diagonally, as 



