First Principles of the Differential Calculus, §c. 269 
cle of M. Will’s concerning M. Reizet’s experiments upon the 
new method of estimating the nitrogen of organic bodies. M. 
Will has not been able to obtain an appreciable quantity of ni- 
trogen from the combustion of sugar and other organic ponent 
ces free from nitrogen. 
1.214 gram. sugar candy, burnt with the soda and lime, gave 
0.00086 gram. nitrogen, which — 0.07 per cent. of the 
qhgat used. 
0.386 gram. stearic acid gave 0. 00028 gram. nitrogen. 
i Bumerpns other experiments were made with a larger auaiaies 
of the same and other substances, with similar results, and he 
accounts for M. Reizet obtaining ammonia from sugar, by suppo- 
sing that his mixture of soda and lime contained a nate prob- 
ably the nitrate of potash. 
Dr. Fownes has also been testing the experiments of M. Reizet, 
and finds them incorrect, substantiating those of M. Will. 10 grs. 
crystallized tartaric acid gave him 0. Saal P: e. Sanpgsay a steered 
too small to be considered. 
_M. Constantin Zwenger, in his article on Blaterin, thon! der 
Chem. und Phar. Sept. 1842,) states that this substance contains 
no nitrogen, having satisfied himself of that fact by MM. Varren- 
trapp and Will’s method, the substance being eonatithtat me fal 
— G20 Hlt4 O05, 
_T have also examined a ppeditnts of animal. ¢ chareoal that tga 
M. Laurent by the old method 2. ce ich 
ps burnt with the soda and lime gare n im 26 pr cn. a 
Yours, &e. re . ah Smiru. 
iidlacisns June 9, 1843. 4 Oe ea 
a 
Arr. VI. esau t on the First Principles of the Differential 
Calculus, together with a new investigation of Taylor's The- 
; arenes = by Prof. Rona Sraoxe. 
sisted i Sa “  fanction: of z, and suppose. that 2 is chang- 
ed to ath; then 9¢ becomes 9(z-+h), which it is our object to 
in a series ; considering x and h as indeterminate quanti- 
ties, sghich: are independent of each other. 
’ ‘We may evidently assume o(2+h)=92-+(A+B)yvh, (1), (a 
finite expression ;) and suppose that A is a function of « and in- 
