containing Nitrogen. 471 
The quantity of nitrogen per cent. in each of the pure salts 
is as follows: — 
per cent. 
Sulphate of Ammonia (crystals) . 18°80 
Nitrate of Soda. . . - « © == 16°55 
Nitrate of Potassa. . - « « + 13°96 
This calculation leaves out of the question the adventitious 
water contained in the salts as they are met with in commerce, 
and which in nitrate of soda is very considerable, sometimes 
as much as 10 per cent., and besides, nitrate of potassa usually 
containing from 2 to 12 per cent. of chloride of sodium, would 
in each case reduce the per centage of nitrogen. The quan- 
tity of solid impurity in the sulphate of ammonia used in these 
experiments was less than one per cent. 
The quantity of gluten in the different samples of wheat, 
which forms a very considerable item in the determination of 
the relative value of these manures, was not obtained, in con- 
sequence of the error of the foreman, who used the reserved 
samples for seed; but an approximation may be obtained by 
comparing the weights of equal bulks, as it is constantly found 
that the heavier the sample, the more water is absorbed by 
the flour made therefrom, and consequently the more gluten 
it contains: by referring to the column of the table which 
shows the weight of a bushel of each sample, it will be seen, 
that for the quantities used, sulphate of ammonia (Nos. 2 
and 3) is superior to the nitrates of soda or potassa (Nos. 4 
and 5). 
The object of these experiments having been to approxi- 
mate the original cost per acre of these manures, rather than 
their weights, is the reason why equal weights of sulphate of 
ammonia and nitrates were not used: neither is it believed 
that the result would at all correspond with the real result of 
the actual experiment were we to deduct one-fifth from the 
ee ee Td ee (ee ena 
38 SE Cost of |S a8 et 
cont [2G | Bronce [ES|EatUCeat raceme] mete see |S | 
per |34 9) of Corn |5 S| chaff per | ° Corn |Comper|s # S/S eele2 
acre. |O& er acre. |> |; er acre. perlSSeiscelsse 
ES 5\P aa acre. | bushel. 5% $5 5 8\2 3 § 
Dressing. $< 
g£ s.d.| Ibs. | Ibs. | bu.|1bs.| Ibs. | tru.| lbs. |b.p.g.) 2 s. d. Ibs.|tr 
No Manure...ssessee| coseeases 3700 | 1413 | 233] 594}2287 | 633 
28lbs. of Sulph. Am.| 0 5 10 | 3900 16123] 263] 60 }29873) 633|1993|3 1 1) 0 1 113 $/—| 141 | 294 
140Ibs. Ditto... 11 9 | 4570 | 1999 | 323) 613}2571 | 713 586 |900)02 5 41:5 | 212 
’ Welbs. Nit. Soda ...| 1 4 6 | 4390 | 1905 | 313} 603|2485 | 6g |4683)7 3 1) 03 2 |198 53| 34° | 138 
112Ibs. Nit. Potassa.| 17 6 4264 |1890 | 313| 603|2378 | 66 4533/7 211/03 8 126 |24] 33°5 92 
