THE SOURCES OF THE NITROGEN OF VEGETATION, ETC. 543 
Tas.E I1].—Showing the supply of combined Nitrogen, as Sulphate-of-Ammonia 
solution, to plants grown in 1858. 
‘Nitrogen supplied. 
Dates. | | 
oa leg Oats. |Wheat*. ar Oata*. | Pea. | Clover. | Bean*. a 
grm. | grm. | germ. | grm. | grm. | grm. | grm. | grm. | grm. | germ. 
May 22 ...cccsovoseeee 0040 | -0040 | °0040 |. - : 
June 7 ceccesceecee ees] 0040 20040 [20040 | oe. | cece | ceeeee 0040 |-0040 
June 21 .........00008-/ 0040 | 0040 | 0040 
June 26 0040 | 0040 | °0040 | i. | week | cceeee | cee eee 0040 
July 3 +1 °0040 | 0040 |°0040 | oo... | cencee | ccenee | ceeeee 0040 
July 12 crccceceveceeee| 90040 | 0040 [20040 | ceccc | ceeuc. | ceeeee | cee eee 0040 
July 14 .............2.]°0040 | 0040 | 0040 | -0040 |-0040 |-0040 | .. .., 0040 | -0040 
July 19 .............../°0040 | 0040 | ...... 0040 |:0040 |*0040 | ...... 0040 | 0040 
Vly 28: svtacisseessent| secu 0040 | ...... 0040 |-0040 | -0040 | ...... | 0040 
July 29 .cececeeees 0040 
August 10 ............ 0040 | anise | wevese | seaves, | iowvaes | seewwe | oonees 0040 
August 17 ............ +0036 | -0036 | ...... 0036 | +0036 |-0036 | ...... 0036 | -0036 
August 24 axl! ceases “10036 
August 26 .........e0 0036 
September 7 ......... 0036 | -0036 | ...... 0036 | -0036 | +0036 | ...... 0036 | +0036 | 0036 
October’ Svsessssweise|asesec: | aechane | setaee | wetesec| Gasane. | aware. || teres 0036 0036 
October 24asivicscasec| cae | ceccee | eevess 0036 |-0036 |-0036 | ...... | ...... 0036 | 0036 
Total ............| 0508 |°0468 | 0280 | °0228 | 0228 |-0228 0040 | 0428 |-0188 | -0108 
Phosphate-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 were 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 SO, as the pipette of sulphate-of-ammonia solution then in 
use, namely, ‘0114 gramme SO,, corresponding to ‘004gramme 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 up 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 
* These plants were grown in M. G. Vitin’s case. 
MDCCCLXI. 45 
