PROPORTIONS OF WEIGHT TO BULK. 



193 



DEPTH OF SOWING WHEAT. 



Wheat may be sowed too shallow as well as too deep. 

 The depth must vary with the soil. A thinner covering is 

 required in a close, thick, heavy soil, than in one light, 

 gravelly, and sandy. Experiments, made with wheat give 

 the following results : 



Appeared above No. of plants 



ground in that came up. 



Seeds sown to the depth of ^ inch. 1 1 days. 



12 

 IS 

 20 

 21 

 22 

 23 



all. 



PROPORTIONS OF WEIGHT TO BULK. 



TABLE, showing the weight per cubic foot of various sub- 

 stances, and the number of cubic feet required to make a 

 ton of each. 



* At the level of the sea. 



t Not under pressure. 



