Scientific Intelligence. 271 
Chemical examination of four new Quinquinas from the Province of 
Ocagna, New Grenada.—These four Quinquinas have never appeared 
in commerce, and it was important to ascertain their richness in qui- 
No, 1. Specimen labelled Pale Red Quinquina from New Grenada. 
No. 2. » « White “ from the province of Ocagna. 
No. 3. y ad Brownish red =“ - 
No. 4. 6 6s Rose red 6s 6s “s 
One kilogram of the Quinquina afforded, in grammes: 
No. 1. No. 2. No. 3. No. 4. 
Sulphate of Quinine, 0-18 0:06 15°50 
Cinchonine, —- « 0-02 0-12 4:00 
_Itis seen that only one of these Quinquinas js of any interest: it is 
0, 4.. M. O. Henry has not been able to determine the species 
Which the bark belongs. 
=_—_ 
SCIENTIFIC INTELLIGENCE. 
I. Cuemistry AND Puysics. 
has presented the American student with a very complete and excellent 
Introduction to the science of mechanics. A work in which the ana- 
i 
utes analysis. The whole science of mechanics is contained in six 
€quations. Prof. Bartlett, following Lagrange, deduces these equations 
ater a brief preliminary introduction giving the necessary definitions 
‘od explanations of the terms used. From these equations formulas 
plicable to particular cases are deduced, and the work will be found 
Mane ovens and completely illustrated by examples and problems. _ 
ch matter of a purely practical character is introduced, and the — 
