204. | Miscellanies. 
18. Lethea Geognostica, oder Abbildung und Beschreibung der 
fiir die Gebirgs-Formationen bezeichnendsten Versteinerungen: von 
Dr. H. G. Bronn, Prof. an der Univ. zu Heidelberg, Svo. with 
lithog. in 4to. Stuttgart. 1835.—This extensive work is devoted to 
the descriptions and illustrations of the numerous species of organic 
remains, and when completed will form one of the most valuable 
treatises on this subject. In the very abundant references to authors, 
the large number of synonyms given, and the full lists of localities 
accompanying the-descriptions, the work evinces the industry, zeal 
and accurate science of its author. The lithographic plates which 
accompany the work, are elegant specimens of this art, and as far as 
we can judge from the specimens that have come under our observa- 
tion, are accurate illustrations of the species. We observe among 
them quite a large number of the fossils of our own geological for- 
mations. 
19. Elemente der technischen Chemie; zum Gebrauch beim Un- 
terricht im K6nigl. Gewerbinstitut und den Provinzial-Gewerbschulen 
des preuss. Staats: von Ernst Lupwie Scuupartu, Doctor der 
Philosophie, Medecin und Chirurgie, ausserordentlichen Professor an 
der K6nigl. Friedrich-Wilhelms- Universitat zu Berlin, &c. Zweite 
sehr vermehrte Auflage. 2 Bande, Svo, mit 20 Kupfertafeln. Ber- 
lin, im Commission bei August Riicker. 1835.—The work whose 
title is here given, is a treatise on the application of Chemistry to 
the Arts, and includes extended observations on the uses and modes 
of preparation of ‘the substances employed in the various processes 
in the arts. ‘There are very few of these processes, at the present 
day, that have not received signal improvements from the discoveries 
of scientific chemistry, and a knowledge of this subject is rapidly be- 
coming of increased importance, both to those practically concerned 
and to the community at large. This addition to the small number 
of treatises on this subject, has therefore been’ received by us with 
extreme interest; an interest, which has been much increased by our 
perusal of the work. | 
The first volume commences with an introduction to the subject, 
occupying sixty pages, in which the different kinds of chemical appa- 
ratus and modes of operation are fully explained. ‘The author next 
proceeds to an account of the elementary substances and their inor- 
ganic compounds, arranging the remarks in chapters treating sever- 
ally of the different elements. After thus occupying about one 
