42 



N. 



H. EXPERIMENT STATION [Bulletin 253 



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 3 C 



Ss 





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u 



HI 











in 



a 

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bo 



a 



u 



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 in 



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o 

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o 

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o 

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in 



o 

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in iH 

 coin 



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c to 

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into 



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oin 



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c a 



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tt fe C fe 



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 CO in 



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in C5 



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o 





w 



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to a 



« C3 



M 

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M 



c3 ci 



flHI-1 



c 



sE - 



tD c3 



O =3 

 bccs 



:=0 



cs 







»& 2 



Orrt 



C3 S-i-'" 

 O O 



* .-J 

 PQ & 



P5i;p5 



MS 



