L. Lesquereux on the Coal Formations of the United States. 23 
up to 1850, the time of its publication. The descriptions (with- 
out figures) are insufficient for the beginner. 
Prof. H. G. Bronn has published in his Lethea Geognostica a 
number of fossil plants of the coal. 
From Prof. E. I. Germar we have eight livraisons (the last in 
1853) of coal plants. The work in folio has very good plates 
and descriptions, but progresses very slowly. 
Gutbier (Aug. v.) published in 1836 a a small work on the 
fossil plants of the coal of Zwickau. Though it is printed on 
teak paper and is without pretention to scientific value, this small 
00k contains a great amount of solid information, and will be 
Consulted with pleasure and profit by those who are interested 
mM our coal flora. 
The Versteinerungen der Steinkohlen Formations in Sachsen, by 
Prof. Bruno Geinitz (Leipsic, 1855), is a magnificent folio boo 
With splendid tables and excellent figures. It has been made 
With great care and from the examination and comparison of a 
gteat number of specimens. This is probably the best work to 
* I would tot éven make this poaasees ¥ so — ti Syed pied eo 
on the Flora of the tertiary of Euro no eg 
lished on the fossil labia of the fettat formations, 
