344 0. C. Marsh—History and Methods of 
Pp Pp 
plants of the Vosges,” 1845, was well illustrated, and contained 
noteworthy results, 
Géppert, in 1836, published a valuable memoir stb 
in solution. After a slow saturation, the substances were dried, 
and exposed to heat until the organic matters were burned. 
In this way Géppert successfully imitated various processes of 
a and explained many things in regard to fossils 
clear up the doubts about the formation of that substance. In 
1841, Géppert published an important work in which he com- 
pared the genera of fossil plants with those now living. 
ndre, Braun, Dunker, Ettinsghausen, Geinitz, and Golden- 
berg, all made notable contributions to fossil Botany m 
Germany, during the period we are now considering. 
erussac’s various memoirs on land and fresh water fossl 
ells, were valuable additions to the subject. A later work of 
great importance was D’Orbigny’s Pal : 
: +4, which described the mollusca and radiates in detail, 
‘according to formations. The other publications of this author 
both numerous and valuable. Brongniart and Desmarest § 
_ Histoire naturelle 
fvbioneer work on this subject. Michelins’ memoir on the 
fossil corals of France, 1841-46, was another important contre 
bution to paleontology. A gassiz’s works on fossil Echinoderms 
=— Mollusks are valuable contributions to the science. T2@ 
* Description des coquilles fossiles des environs de Paris, 3 vols. Paris, 182437 
