381 



tact, and in the other three, to touching substances, which had shortly 

 before been touched by the plague patients, such as glass, metals, or 

 earthenware ; and he assigned the reasons which led him to this con- 

 clusion, 



3. Analysis of Two New Minerals of the Zeolite Family. 

 By Thomas Anderson, M.D. Communicated by Dr 

 Christison. 



The minerals in question are the Phakolite of the Bohemian 

 Mittelgebirge, and Caporcianite, a newly discovered mineral, first ob- 

 served by Dr Savi, in a copper-mine at Caporciani, in the valley of 

 Csecino. The author found, that in point of composition, Caporcia- 

 nite belongs to that division of the zeolites, which comprehend 

 Analcine, Ledererite, Potash-harmotome, Chabasie, and Levyn, and 

 whose constitution is represented by the mineralogical formula 

 r S*-f-3 AS^ + r Af^, — z being a variable quantity, r representing 

 the variable monatomic bases, and A & S alumina and silica. The 

 formula for Caporcianite proved to be r S- -f 3 A S2 + 3 A 7, and the 

 monatomic base consists chiefly of lime. Phakolite belongs to that 

 groupe of zeolites comprising Gigantolite, Harringtonite, Mesotypc, 

 Lehuntite, Mezolite, Scolezite, Pyrargillite, and Antrimolite, whose 

 composition is represented by the mineralogical formula r S^ -f a; A S -f- 

 zA.q, — the equivalents of alumina and silica being variable, as 

 well as water ; and the formula for Phakolite is r S^-f-2 A S -f 3 A 9, 

 the monatomic basis being lime, potash, and soda. The numerical 

 proportions of the constituents of the two minei-als were as fol- 

 lows : — 



Caporcianite. Phakolite. 



Silica acid, 52.8 ... 45.628 



Alumina, 21.7 ... 19.480 



Peroxide of iron, 0.1 ... 0.431 



Lime, 11.3 ... 13.304 



Magnesia, 0.4 ... 0.143 



Potassa, 1.1 ... 1.314 



Soda, 0.2 ... 1.684 



Wattr, 13.1 ... 17.976 



100.7 ... 99.960 



|4. Dr Christison exhibited specimens from the Government 

 Superintendent of Tea Culture in Assam, illustrating 



