a 5 Prof. E. N. Horsford on Gilycocoll, §c. 369 
Arr. XXXVIIL.—Glycocoll (Gelatine Sugar) and some of its 
: Products of Decomposition ; by E. N. Horsrorn. 
(Read before the Albany Institute, September, 1846.*) 
_ As there are laws in physics, whose evolution, carefully traced, 
would constitute a general history of this department of science, 
so there are bodies in chemistry, whose career, if we may employ 
such an expression, accurately followed out, would acquaint us 
with the prominent periods through which this science has passed. 
The history of sulphuric acid, for example, may almost be said 
to be-the history of technical chemistry, as that of hydrosulphuric 
acid and ammonia is of analytical; or, as that of oxygen is of 
theoretical chemistry. 
in order to their being considered correct ; and finally, of a tiny 
raconhot,t in 1820, by treating isinglass with sulphuric acid, 
obtained a body of sweet taste, ready solubility in water, difficult 
solubility in alcohol, capable of uniting with nitric acid, and in 
s state of combination uniting with alkalies and alkaline 
earths; to which substance he gave the name of sugar of gela- 
une, (sucre de. gelatine. ) : Sati 
Boussingault,t to whom we are indebted for the first analysis 
of this body, gave it the formula C,,H,,N, 0,1, which, ex- 
pressed in equivalents, isC,,H,,3N,0... athe 
__ From this body he obtained a erystallizable compound, with 
the protoxyd of lead, which, upon analysis, yielded the formula 
C..H, oe O,+3PbO.. Three atoms of protoxyd of lead had 
taken the place of two atoms of water. 
* Published in Liebig and Wéhler's Annalen, 1046; and translated for this 
Journal the author. me 
t Annal. de Chim. et de Phys., T. xiii, p- 113. 
t L'Institut, No. 245. Phar. Cent. Blatt, No. 50, 1838. 
Secoxp Senies, Vol. Il, No. 9.—May, 1847. 47 
