BISCHOF ON MINERAL PHOSPHATES. 25 
kingdom, and which led to the discovery of phosphoric acid in springs. 
The tendency of these two acids to enter into common combinations 
is observable in apatite and most of the other minerals, and is also 
the reason why bones take up a larger proportion of fluoric acid the 
longer they remain buried in the ground. This is not to be wondered 
at, for fluoric acid is as universally distributed as water: it is found 
even in the sea. 
(J. NJ 
—_————— —__ 
Produce of Gouv in the Urat and Siperta in the year 1846.— 
Erman’s Russ. Archiv. 1847, Bd. vi. p. 318. 
AccorpDING to a notice in the ‘ Kommertscheskaja Gaseta,’ or 
Russian Commercial Journal, published by the Ministry of Finance, 
in February 1847, there had been remitted to the Mint at St. Peters- 
burg 1397.378 pud of gold, the produce of the Imperial and 
private mines in the Ural and Siberia during the year 1846. There 
was still expected 325.368 pud of gold, the produce of these mines 
in that year. 
The total produce therefore of Russian gold in 1846 was 1722.746 
pud, or about 62,792 lbs. avoirdupois, whilst in the previous year 
(1845) it was only 1371.800 pud, or 49,522 lbs. avoirdupois. The 
annual increase, which had fallen in the last two years to 47 and 30 
pud, has consequently risen to 351 pud, or 12,670 lbs. avoirdupois, 
which much surpasses any previous increase ; the largest formerly, or 
that between 1842 and 1843, being only 323.80 pud. NY 
a eee 
NEW BOOKS. 
Humboldt, A. von. Kosmos, Entwurf einer physischen Weltbeschrei- 
bung, vol. ii. 8vo. 
Erman, A. Archiv fiir wissenschaftliche Kunde von Russland, 
vol. iv. 8vo. 
Bischof, G. Lehrbuch der chemischen und physikalischen Geologie, 
vol. 1. parts 1 & 2, 8vo. 
Carus, Dr. C. G., Dr. H. B. Geinitz, &e. Untersuchungen iiber das 
Hydrarchos, folio, 8 plates. 
Naumann, C. F. Geognostiche General-charte des Konigreichs 
Sachsen. 
Giebel, C. G. Fauna der Vorwelt, vol. 1. Wirbelthiere, 8vo. 
Hawle, I., und A. J.C. Corda. Prodrom einer Monographie der boh- 
mischen Trilobiten (7 plates). 
Heer, O. Die Insektenfauna der Tertiargebilde von Oeningen und 
von Radoboj in Croatien, vol. i. 4to (8 plates). 
Meyer, H. von. Zur Fauna der Vorwelt. Die Saurier des Muschel- 
kalks, part 1, folio (12 plates). 
Paleontographica, Beitrige zur Naturgeschichte der Vor- 
welt. 
