THE SOURCES OF THE NITROGEN OF VEGETATION, ETC. 



Table III. — Showing the supply of combined Nitrogen, as Sulphate-of-Ainmonia 



solution, to plants grown in 1858. 



54< 



Dates. 



May 22 

 June 7 

 June 21 

 June 26 

 July 3 

 July 

 July 

 July 

 July- 

 July 



12 



14 



19 



28 



29 



August 10 .. 

 August 17 .. 

 August 24 .. 

 August 26 ... 

 September 7 

 October 5.., 

 October 24.., 



Total 



Nitrogen supplied. 



Wheat. Barley. 



Oats. 



grm. 

 •0040 

 •0040 

 •0040 

 •0040 

 •0040 

 ■0040 

 •0040 

 •0040 



•0040 

 •0040 

 •0036 



•0036 

 0036 



grm. 

 •0040 

 •0040 

 •0040 

 •0040 

 ■0040 

 •0040 

 ■0040 

 ■0040 

 •0040 



•0036 

 ■0036 



0036 



0508 -0468 



grm. 

 •0040 

 •0040 

 •0040 

 •0040 

 •0040 

 •0040 

 •0040 



■0280 



Wheat* 



grm. 



•0040 

 •0040 

 0040 



■0036 



0036 

 0036 



•0228 



Barley *. Oats *. 



grm. 



■0040 

 ■0040 

 •0040 



•0036 



•0036 

 •0036 



grm. 



•0040 

 •0040 

 •0040 



•0036 



•0036 

 •0036 



•0228 -0228 



Pea. 



grm. 

 ■0040 



0040 



Clover. 



grm. 



•0040 



0040 

 0040 

 0040 

 •0040 

 •0040 

 •0040 



•0040 

 0036 



■0036 

 ■0036 



•0428 



Beau *. 



grm. 



■0040 

 ■0040 



•0036 



•0036 

 0036 



•0188 



Buck- 

 wheat. 



grm. 



•0036 

 •0036 

 ■0036 



•0108 



Phosphatc-of-Soda solution. — The strength of a dilute solution of phosphoric acid was 

 determined by means of a titrated alkali-solution (for the preparation of which see 

 page 545) ; and it was then neutralized by carbonate of soda. Each pipette measure of 

 this solution given to the plants supplied about -01 gramme phosphate of soda. It was 

 only employed in the experiments of 1858. In the records of growth of the plants, it is 

 stated whenever they w r ere manured with this solution. 



Sulphuric-Acid solution. — The strength of some very dilute pure sulphuric acid was 

 determined in the same manner as was that of the phosphoric acid, as stated above. It 

 was then so far reduced, that the pipette measure by which it was applied to the plants 

 contained exactly as much S0 3 as the pipette of sulphate-of-ammonia solution then in 

 use, namely, -0114 gramme S0 3 , corresponding to -004 gramme N. For the application 

 of this solution see the records of growth of the plants. 



The value of each of the above solutions was determined by analysis, to ensure that it 

 was such as was supposed. 



B. — Taking vp the Plants, preparation for analysis, methods of analysis, &c. 



At the termination of growth the glass shade was washed outside, quicksilver was 

 poured into the groove to displace from it the condensed water not removable by the 

 arrangement of apparatus of 1857, or already collected in the drain-water bottle 

 adopted in that of 1858, as the case might be, and the shade was then removed. The 



MDCCCLXI. 



* These plants were gro^vn in M. G. Ville's ease. 

 4 E 



