Miscellaneous. 



According to our analyses of this substance it would appear to be 

 a variable mixture of several minerals. M. Pisani himself finds 

 ten per cent, of intruding silica in it. 



Adamite, a new and interesting hydrated arseniate of zinc is also 

 described in the "Comptes Eendus " for March 19th. M. Friedet's 

 analyses of this species points to the formula — 



Zua As, Zn H. 



In the new notation, with the higher atomic weights adopted by 

 Cannizzaro, this expression may be given — 



3ZnO, As^Og, ZnH^Oa. 

 Adamite is similar in crystalline form and in constitution to olivenite. 

 It occurs with native silver, limonite and calcite at Chaiiarcillo, Chili. 

 The crystallography of adamite has been worked out by M. Des 

 Cloiseaux. Knop has described under the name of Paclinolite, a 

 mineral occuring in Greenland with cryolite, and presenting a 

 weathered aspect. It differs from cryolite chiefly by containing 

 calcium. — ^A. H. C. 



Feerous Chloride in a Mineral Water. — In one of the saline 

 waters of Harrogate, known as the "Cheltenham saline chalybeate," 

 Dr. Hofmann, twelve years ago, ascertained the presence of 4-63' 

 grains of ferrous carbonate (proto-carbonate of iron) per imperial 

 gallon. Dr. Muspratt, of Liverpool, has recently examined the water 

 derived from the same spring, and he now finds it to contain 10.84 

 grains of ferrous carbonate per gallon, and, in addition to this iron 

 compound, he has detected ferrous chloride to the amount of 16 

 grains per gallon. The salts contained in the water seem to be 

 almost entirely chlorides ; in the gallon there are 454 grains of 

 various chlorides, including 7*72 grains of chloride of barium, a salt 

 of which traces only occur in other strong saline springs. — A.H.C. 



Comparative Analyses of the Mediterranean, Eed Sea, and^ 

 Dead Sea, by MM. Eobinet and Lefort. — The results give the per- 

 centage composition of the solid residue obtained by evaporation : — 



— Chemical News, May 11, 1866. 



Eecent Earthquakes. — 1. The first shock of an earthquake at 

 Chittagong, Bengal, was felt on December 15th, 1865, at 6.50 p.m., 

 and between that time and 2 a.m. on the 20th of the same month, 

 twelve distinct shocks were felt, of various degrees of intensity. In 

 Thannah Eoajan the earth's surface cracked in several places and 



