90 



AGRICULTURAL TEXT-HOOK. 



227* Petri gives an experiment made to ascertain the proper depth 

 for planting rye, as follows : 



Depth of seed, 



% inch. 



1 &quot; 



2 inches. 



3 &quot; 



4 &quot; 



5 &quot; 



6 &quot; 



Appeared above ground in 



Kths. 

 all. 



Jl days. 

 12 



18 

 20 

 21 



22 



23 7B- 



The root stalk forms itself always next below the surface of the 

 ground ; and if we place the grain deep, it must first put out its sprouts 

 to the surface, and form its side branches in a nearer connection with the 

 air. We never find that the sucker-roots are arranged from below to 

 above, but the contrary. 



No. of plants that came up. 



