403 Miscellanies. 



Local Secretaries. — Professor Nichol, LL. D., Andrew Lid- 

 bell, Esq., John Strang, Esq. 



Local Treasurer. — Charles Forbes, Esq., Banker. 



Committees.— On finance. — The Hon. the Lord Provost, Convener. 

 John Leadbetter, 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 Smith, Esq., Archi- 

 tect, Sub-Convener. Alex. M'Dowall, Esq., Writer, Secretary. 



On exhibition of Models and Manufactures. — John Houldsworth, 

 Esq., Convener. Wm. Hussey, Jun. Esq.-, Sub-Convener. James 

 Thomson, Esq., C. E. Secretary. 



On Museum of minerals found in the West of Scotland. — Thomas 

 Edington, Esq., F. R. S. Convener. Wm. Murray, Esq. of Monk- 

 land, Sub-Convener. Dr. Wm. Couper, Professor of Natural Histo- 

 ry, Curator. Thomas Edington, Jun. Esq., Secretary. 



5. Classification of Rocks. — Extract of a letter from R. I. Mur- 

 chison, Esq., to Prof. Silliman, 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 

 Germany, Belgium, &c., and their relations to our British rocks. I 

 am most impatient to test the value of this classification in the United 

 States, but a 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." 



2L On the action of Metallic Tin on solutions of Muriate of Tin ; 

 by Augustus A. Hayes. 



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 oc- 

 tahedral crystals, at others, long prismatic needles, which are so ar- 

 rano-ed as to form skeletons of such sections. In this Journal, Vol. 

 XXVII, p. 255, Mr. W. W. Mather has described some experiments 

 having a similar result. The interest which has been excited of late 

 by notices of the non-action of metals in acid solutions and in rela- 

 tion to chemical action of a similar kind, has induced me to publish 

 the facts which I sometime since observed. 



