Nr 



51 L 



' Dense of an Acre of Wheat. 

 ^ 1790. 1804. 



17 

 17 



3 



11 



15 

 14 



2 

 12 



1 



11 

 10 

 10 



8 

 12 

 16 



A^ 



lo\ 



/:• 



10 

 10 



7 

 12 



13* 

 6 



10 



12 



18 



8 



19 



10 

 6 

 19 

 10 

 12 

 18 

 15 



10 



Ni 



