ON THE QUANTITIES OF NITRATES STORED IN PLANTS. 473 



in October and taking samples from the field from time to time. 

 The differences here found were not so large as in the other case, 

 where the objects were kept in a state of rest after they had been 

 harvested. 



Object. Root of 



Dates of collection. 



Nitric anhydride in 

 100 parts of dry 

 matter. 



Raphamts sativus 



15 Oct 



4.80 





21 „ 



4-13 





28 „ 



4-77 





4 Nov. 



5.16 





13 



4.06 





25 



3.25 CD 





9 Dec. 



2.SO 





20 „ 



3 34 





27 Jan. 



2.66 





12 Feb. 



3-5o 





10 March. 



2.21 





29 Apr. 



3-95 f2) 





22 May. 



3-7o 



Object. Root of 



D.ites of collection. 



Nitric anhydride in 100 

 parts of dry matter. 



Bras si ca campestris 



21 Oct. 



2.27 





28 „ 



2.45 





4 Nov. 



2.36 





18 „ 



2.44 





9 Dec. 



0.67 





20 „ 



1.06 





27 Jan. 



1.09 





12 Feb. 



1 .21 



(1) Frost had set in. 



(2) This determination was made with a young plant. 



