408 Miscellanies. 
Local Secretaries.—Prorrssor Nicuot, LL. D., Anprew Lip- 
DELL, Esq., Joun StTRANG, Esq. 
Local Treasurer.—Cuar ts Fores, Esq., Banker. 
Commiitees.—-On finance.—-The Hon. the Lorp Provost, Convener. 
Joun LeapBeTTeR, Esq., Sub-Convener. James M’CLELLAND, Esq., 
Accountant, Secretary and Treasurer. 
To provide sectional and other accommodations.—Wm. Ramsay, 
Esq., Professor of Humanity, Convener. James Smiru, Esq., Archi- 
tect, Sub-Convener. Arex. M’Dowatt, Esq., Writer, Secretary. 
On exhibition of Models and Manufactures.—JoHn HovLpsworTH, 
Esq., Convener. Wma. Hussey, Jun. Esq., Sub-Convener. James 
Tuomson, Esq., C. E. Secretary. 
On Museum of minerals found in the West of Scotland —Tuomas 
EpiNncron, Esq., F. R. S. Convener. Wn. Murray, Esq. of Monk- 
- land, Sub-Convener. Dr. Wma. Covrer, Professor of Natural Histo- 
ry, Curator. Tuomas Epineron, Jun. Esq., Secretary. 
5. Classification of Rocks.—Extract of a letter from R. 1. Mur- 
CHISON, Esq., to Prof. Sirtiman, dated London, Feb. 24, 1840. 
“In furtherance of the views which we propounded last year, of 
classifying the ancient rocks beneath the carboniferous system into 
three great systems or terrains, ‘ Devonian,” “ Silurian,” and ‘‘ Cam- 
brian,” Prof. Sedgwick and myself are about to read before the Geo- 
logical Society of London a memoir, in which we endeavor to show 
the true succession of these strata in the Rhenish provinces, parts of 
nany, Belgium, &c., and their relations to our British rocks. I 
am impatient to test the value of this classification in the United 
States, ‘puta | year at least must elapse before I can think of an expe- 
dition to your shores. Complete suites of the fossils of the infra-car- 
boniferous rocks would be most valuable to me, and most gladly re- 
paid by a copy of my large work, or with Silurian fossils.” 
21. On the action of Metallic Tin on solutions of Muriate of Tin; 
by Aveustus A. Haves. 
It has been long known to those who frequently dissolve tin in mu- 
riatic acid, that under some circumstances, the metal after it has been 
dissolved is precipitated. It sometimes presents large sections of 0¢- 
tahedral crystals, at others, long prismatic needles, which are so aT 
ranged as to form skeletons of such sections. In this Journal, Vol. 
XXVII, p. 255, Mr. W. W. Mather has described some experiments 
oi a similar result. The interest which has been excited of late 
y notices of the non-action of metals in acid solutions and in rela- 
to chemical action of a similar kind, has induced me to publish 
pect which I sometime since observed. # 
