130 MEMOIR ON THE SCIENTIFIC CHARACTER 



He calls it a " hydrated silicate of alumina and soda." 

 In relation to this paper on Zeolites, the following notice is 

 contained in Tilloch's Philosophical Magazine, vol. xxxvii., 

 from January to June, 1811, (p. 152,) under the head of the 

 " Proceedings of the Royal Society : " 



" February 7th, Mr. Smithson's paper on Zeolite was read. This in- 

 genious mineralogist having received some specimens of this mineral from 

 Hauy himself, and labelled by his own hand, he deemed it a favorable 

 opportunity of ascertaining if there were any chemical difference between 

 the mesotype of the French crystallographer, and zeolith of Klaproth, as 

 he had previously discovered the existence of soda in all the specimens of 

 zeolite, which are found in these kingdoms, as well as those in Germany. 

 M. Vauquelin analyzed several specimens of zeolite, without discovering 

 any traces of soda, but Mr. Smithson discovered alkali even in the mezo- 

 type sent him by M. Hauy, and in every other specimen of zeolite in his 

 possession. From this circumstance he is inclined to prefer the original 

 name of zeolite as given to this mineral by its discoverer Cronsted, to that 

 of mezotype, as given it by Hauy, and considers the distinction between 

 mezotype and natrolith as unsupported by chemical analysis." 



5. In the Phil. Trans, vol. ciii. (1813,) p. 256, to 262, is a 

 paper " On a saline substance from Mount Vesuvius." Read 

 July 8, 1813'. 



This paper gives a chemical quantitive analysis of a com- 

 pound sulphate of potash. 



Sulphate of potash 71.4 



Sulphate of soda 18.6 



Muriate of soda 04.6 



Muriate of ammonia"} 



Muriate of copper > - 05.4 



Muriate of iron j 



100.0 



In the commencement of the paper are some very interest- 

 ing general views relative to the connection of volcanoes 

 with the theory of geology. One remark is worthy of 

 citation : 



" In support of the igneous origin here attributed to the primitive strata, 

 I will observe that not only no crystal imbedded in them, such as quartz, 

 garnet, tourmaline, &c., has ever been seen enclosing drops of water, but 

 that none of the materials of these strata contain water in any state." * 



6. In the Phil. Transactions, vol. ciii. p. 64, (1813,) is a 

 paper " On a substance from the Elm Tree, called Ulmine." 

 Read December 10, 1812. 



This paper gives an account, 1st. Of ulmine received 

 from Sicily ; 2d. Of English ulmine ; and 3. Of the sap of 

 the elm tree. 



* In confirmation of this statement see a late paper by Professor Lewis 

 C. Beck, entitled u Views concerning igneous action," in Silliman's Jour- 

 nal, vol. xlvi., page 337, April, 1844. 



