272 Scientific Intelligence. 
gradually gained during the trial 70 grm. in weight. Assuming that 
this increase consisted in Sitti tissue, as must be supposed from 
the character of the food, it corresponds to 2'4 grm. of nitrogen. This 
added to the quantity found i in the excrements leaves but 1:1 grm. un- 
accounted for, a quantity admitting of a loss of 3% milligramme daily, 
and so small, considering the duration of the trial, as to a ae 
attributable to errors of experiment. 
Il, METALLURGY. 
. New works.—Zusammenstellung der statistischen Ergebnisse des 
Diiiethis Hiitten- und Salinen-Betriebes in dem Preussischen Staate 
withrend dé? zehn Jahre von 1852 bis 1861; Bearbeitet von E. Arrays, 
4to, pp. 156, with 4 lithographic plates. Berlin, 1 863.—This valuable 
collection of statistics of the mineral production of the Prussian States 
for the ten years, 1852-61, is published as a supplement to the 10th vol- 
ume of the Zeit tenet fir das Berg- Hitien- und Salinenwesen in dem 
Preussischen Sta 
From this we sees the following in regard to the productions for 
the year 1861: 
Total value of mineral a . 81,234,628 Thalers. 
Number of mines wor 
Number of workmen em eats ho ee Oe A Wik cease ets 115, 
a verage amount produced by | each mine 2581 Thalers. 
workman, 271 
a ring the past twenty-five years the asine of, the mineral products 
has increased sixfold, the number of workmen 34 times, and the number 
< mines has increased ~~ 1587 to 2304. 
We have not apes o give further _— spans this pani 
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regard to ont r wealle and mineral productions, . 
2. Handbuch der metallurgischen Hiittenkunde, von Broxo Ken 
vol. ii, mt ae 848, with 8 lithographic plates. Freiberg, 1863.— 
This second volume of the new edition of Kerl’s work on Metallargy 
treats "of | the special metallurgy of lead, copper, zinc, cadmium, tin, met- 
cury and bismuth. In the first edition these subjects occupied 384 pagesy 
while in the present volume more than twice the space is covered by 
nd accuracy of Kerl’s work commends it nob 
only to — —— but also to all scientific men who desire 
to have t idea i i 
T Prot, Calif. Acad. Nat. Sei., vol. iti, p. 6. 
* 
