414 Scientific Intelligence. 
chemical constitution, Wanklyn prefers the formula ((€,H,)'"Na’’)’, 
sodium-zinc-ethyl and sodium tri-acetyl, and regarding it as t 
analogue of nitrogen and arsenic, rather than of hydrogen. Beside 
the acetate, the valerate and benzoate of this radical, ‘and the ace- 
tate and valerate of the homologous radical, amylene-sodium, have 
re pra by Wanklyn. —Phil. Mi Ug. IV, XXXVil, =n March, 
. On some Acetyl compounds of the Cobslahapdiveten: Senn 
ZENBERGER and Navupin rite peste the oe of some inter- 
esting researches upon the carbohydr seRictones orgs 
in the form o so shake or r Swedish h ering ‘paper, is eate 
whic 
into water, deposits white ocks of Facet cellulose; ©7Hy (6, 
; la 
dg ted 
are soluble in ehioantrated acetic acid, anes are re-converted into 
cellulose by alkaline solutions. No higher acetyl compound can 
be obtained, either by lo — heating or by any excess of the vert 
to 140° in presence of an excess of odes ava! swells up strongly, 
but does not dissolve. On washing the residue with water, a white 
amorphous mass is obtained, whishieinsolublet in water, alcohol, and 
acetic acid, and is not blued by iodine. Its composition is 
(€,H,9), 6, , and it is decomposed by alkalies, perce the starch 
again. f however, the mixture be heated to 160°, the porous 
mass dissolves, foiveetes an amber-colored syrup, from which water 
precipitates a white a amorphous substance, insoluble in water, al- 
cohol, and ether, but soluble in wate cid, and isomeric with the 
former. hen acted upon by alkalies, it is converted into dextrin; 
it is therefore tri-acetyl dextrin. Neither starch nor dextrin will 
accel derivative, as also does gum arate, In the case of the 
sugars, acetic oxyd attacks them energetically, but to obtain sat- 
urated co 
acetic — cd twen Eis ae to me in Se ho vessels. The 
mpounds, it is necessary to heat them with an excess of | 
Misi 
