Chemistry and Physics. 139 
sealed up in ae tubes a cold seen solution of the former 
and a hot saturated solution of the lat This last tube on cool- 
ing deposited erystals while the first ie did the same on heating. 
After repeating the experiment for class instruction many times, 
the eaeney of the normal butyrate crystals appeared to lessen 
on heating, and on strong cooling crystals appeared eee 
the isobutyrate. This result careful examination confirme ince 
boiling for eight days did not effect the change, time must be the 
oe —Liebig’s Ann., clxxxi, 126, May, 1876. G. Bt Be 
. On the Influence of Z sparagin on Saccharimetry.—Cua 
wer of asparagin upon the indications of the saccharimeter. Its 
aqueous solution NE se saturated 1°66 to 1°72 per cent) 
rotates ae ec ° 14’; after adding ten per cent of am- 
monia — F Pa gard light the rotation — 11° 23’ was ob- 
8.0 coreponing ai pa with that of M. Honehns ite ges 
amount to 0°7 gram of sugar in the 100 c.c. Whe authors eI how 
ever, that the ro oe power of the asparagin is entirely jenkogsd 
by the addition of acetic acid. They recommend the addition to 
the solution, after treatment with the basic acetate, of 10 c. ¢. 0 
acetic acid (at 8°) to every 100¢.c. The same fact to a less de- 
Sree is true of the juice of the cane. The authors propose the titer 
before and after the wees of the acid, as a method for estimat- 
ing as sl in.— C. R., lxxxii, 819, Apr il, 1 876. G. F. B. 
h é Alkaloid princi: and some og Bodies.—HeEssE 
He iubjectod to a new and exact investigation the cinchon a alka- 
act i 
loid discovered in 1829 by Pelletier and called aricine, quad 
rom a new bark Cinchonu pelleterana. He comes to the conclu- 
ew BEV O-TO by rj med 73, re 
aie b in the ay state with cinchonidine. The alkaloid je 
hol second ¢ r gives a true record of the amount of recite pos 
Satan in it. The principle on which this measuring appa- 
in acts may be shortly described thus: The volume of liquid® 
hrou volvi 
