76 Constitution of Gelatine and its Transformations. 
— from hartshorn. Isinglass. Silk. 
II Ill. IV. 
C 50-05 50°05 50°49 50:76 
H 6:48 6:64 6:36 6:64 
N 18:35 1839 19-19 18°31 
O 25°12 24:92 24-96 24:29 
Scheerer who submitted to analysis the unaltered tissues, ob- 
tained somewhat different results. 
Air bladders. Tendons. Sclerotica. 
we Es Vil. 
~C 50°56 50°96 51:00 
H 6°90 7:19 7-08 
N 18-79 18°32 18-72 
O 23°75 23°53 23°20 
In view of all these, Mulder proposes the formula C,,H,, N, 
O,, which requires C=50: OT HG 33s NS 87 95s OY 25: 35. 
he per-centage of carbon accords very well with that of exper- 
iment: but although it may be said that the calculated numbers 
do not differ more from some of those obtained, than these do 
from each other, it is to be observed that the hydrogen and nitro- 
gen are lower, while the oxygen is higher than any determina- 
tions have fixed them. Besides this, the formula is wanting in 
verisimilitude ; the equivalents o arbon and oxygen are 
sented by odd numbers, and saintiting that these express the re- 
atl of “er equivalents, it will be necessary to double the —- 
ent form 
A etait of the results of the decomposition of gelatine, 
will we think lead to a more probable formula. M. Gerhardt ob- 
served some years since, that when this substance is boiled for sev- 
eral hours with dilute sulphuric acid, a large quantity of sulphate 
of ammonia is forme Pa with a sweet non-azotized sub- 
stance which resembled -sugar and was susceptible of fer- 
mentation by yeast, affording acon and carbonic acid gas, thus 
placing its character beyond question. This reaction accorded 
perfectly with the characters of that class of azotized bodies to 
which gelatine has been referred, and seemed to indicate that it is 
to be regarded as an amidized species of glucose or some body 
differing shin it only by the elements of water. On searching 
ra formula which should accord with the results of analysis, 
-and at the same time harmonize with this view, it was found 
that it might be derived from an equivalent of cellulose ot starch, 
and four “of ammonia by the abstraction of twelve of water; 
C,,H,,0, »+4NH,=C,,H,,N,0O,+12HO. The ordinary 
amides are formed by the substitution of the residue NH for O,, 
but in hydro-benzamid and some other compounds, N is hect-4 
eplacing O, in perfect analogy to the formula proposed. 
* See Gerhardi’s Précis de Chimie Organique, tom. ii, p. 521, et seq. 
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