188 HH. Wurtz Contributions to Analytical Chemistry. 
Since these announcements were made, Prof. Hall has informed 
me that he has copper the existence of Permian Rocks in 
Lowa and Illinoi ' 
It is but just a5 state in this connection, that so far as I know, 
Mr. Meek first discovered the Permian character of the Kansas 
fossils, and communicated to Maj. Hawn his ipresign on the 
3d of Sept. 1857. He also mentioned his discovery, as 1am 
informed, to some friends at the Smithsonian Institution on the 
17th of J anuary, 1858, and communicated the same to Prof 
Leidy on the 16th of March. 
aj. Hawn frankly declares, that his first i ine that the 
rocks in question might be Permian are due to Mr. Meek. 
Such are the facts as I Sp oes them. Tf T am wrong, let 
the correction now be made. If any one knows anything oe 
trary to these statements he will confer a favor by making 
known at this time. 
ArT. XX.— seid pesca to Pecpescege Chemistry; by HENRY 
Wurtz, of New York City. 
1. On he Aeon of Nii Acid in the cold upon some Metallic So 
utions, with new modes of ment pure Compounds of i : 
So and Cadmium 
(Read before the American Ames ed og Advancement of Science, at 
In the course of the LOS. which forms the subject of 8 — 
pre vious paper, on the action of hot nitric acid on the chlorids, 
in the last number of this Journal, it will be observed that nitric 
has rendered imperative the commencement of a complete exami- 
nation of its action upon all the chlorids in the cold. This ie 
_ amination is in progress, but some of the results already 0 obtain ° 
being of im se gc lagiens ractical waite, I take this op ee ief pre 
aco each Chiovid i in concentrated solution was added twice _ , 
me, or Eire, of strong nitric acid. With the chlorids of — 
um and cadmium were obtained immediately granular pale 
ne oe. so voluminous that unless too mace, nitric 
