Hull. Agric. CoU. Vol. IV. PI. VI. 













































































































































































































































































































































































1— 



<— 















































































































































































































































1— 





















































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































/OC 



I 



r 























































































































































\ ■ 



A' 













































I 











































— 













































































r 







































































































































































































































\ 













































































































90 







\ 























































































































\ 





















































































































\ 

























































































































































































































t/ / * 











\ 





























































































































































































































































































































































































































, — 1 























































































































. 

















































































































































-7 









































































































































































































































































































































































































































































GO 



















































































































































































































































































































































































































































































































































































































V 













































































— 









































































au 





V 





































































\ 



































































































































































































A/1 































































































































































S 















































































































































































































































i/jj 



X 



































































































































































J 



















































V 



rid. 



r 



. 1 rn </ 



A 







































.3 





































































































































































































































































































































































'■ 



























































































,0 



s 







































































/ 























?Si /' 





























































































. j 



V 



































































/ 

















sf 







J 



1 

































































































!s. 

























































1 















































;\, 







































































y 





























































































A 



* 



























































































/. 

















































• j 

































































































































0 



r 





















































































































10 

































:st/ 

















to . 







































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































This plate shows the influence of light upon the change of nitrogenous compound- 

 Shoots were at first exposed to the full day-light for 19 days, then a portion was kept in 

 the dark for 9 days, while the other portion was still exposed to the day-light. The 

 black lines refer to shoots exposed to the full day-light, and the red lines to those after- 

 wards kept in the dark for 9 days. 



