~ 
142 Book Notices. . 
train of ox wagons and carts for merchandize, to take the party — 
ple its baggage with him: hence its long delay. Twenty-two days — 
were occupied in crossing the plains from Fort Garry to St. Paul, by © 
way of Pembina on Red river and Crow Wing on the Mississippi, 130 
miles above St. Paul, so that the party were not able to get back to 
Cambridge before the 20th of September. 
VY. BOOK NOTICES, - 
1. On the Impurities of Commercial Zine, with Special Reference to 
the Residue insoluble in Dilute Acids, to Sulphur, and to Arsenic; by 
Cuartes W. Extor and Frans H. Sro pp. 40, 4to. (From 
Memoirs of the Deans Academy of raat and Sciences, [N.S.,] vol. 
‘vill, p. 5 
In the eiaborts memoir before us the authors have given a detailed © 
‘account of their investigation of the impurities of eommercial zine 4 
of their endeavors to obtain precise and definite knowledge upon the sub- 
ject, with which to replace the loose, inaccurate and often contradictory 
statements which are current in chemical literature. 
Having in the first place given a very complete synopsis of the opin- 
ions which had previously been recorded, they proceed at once to de 
scribe the re made by themselves. In order that their results 
should be as ral as possible they examined authentic specimens of all 
w 
_ commercial zine, and that the carbon, tin, copper, , arsenic, and 
other impurities found in it by previo sbaervers, occur i cited in very 
ly.” 
e amount of lead in each of the zincs above specified was deter 
mined quantitatively with great care. The sdanlta are as follows :f- 
Name of Zinc. Amount of lead in percent 
Silesian, - “ x . : ae oe : 
Vieille s Montagu, 3 ‘ : = é - 0-292 
New A = (0079 
Pantages oe ee ra - = 0-000f 
Mint, fig to ieee tee oe eee 040s 
Rousseau Fee, ai Seis ae ‘ - 0-106 
Berlin, - * . - 1:297 
* Communicated to the Academy, i 29th, 1860, 
+ For the methods of analysis followed and precautions anes as well as 
merous other interesting details which brag of space compels us to omit, the 
is referred to the original memoir.— 
t This zine leaves no appreciable suaiciod when dissolved in dilute acid. 
