S06 Analyses of Books. [April, 



siliciatcs. Thus ichthyopkthalmite is a hydrate consisting of ivater 

 combined with five integrant particles of trisUiciate nf lime and one 

 integrant particle of trisUiciate of potash : and malacolite consists 

 of one integrant particle of bisiliciate of lime and one integrant 

 particle of bisiliciate of magnesia. 



Berzelius proposes to divide minerals into as many families as 

 there are simple substances known, which amount to about 46. 

 The families are divided into orders, according to the different 

 electro-negative bodies with which the most electro-positive are 

 combined : as, for example, 1. Sulphurets : 2. Carburets : 

 3. Oxides, &c. He gives the following examples of this arrange- 

 ment, which will make it more intelligible. — Silver Family. 

 ]st order : Pure silver. 2d order : Sulphurets. 3d order : Stibiets, 

 consisting of antimonious silver ore and silherspies-gianz. 4th 

 order: Tellurets, containing the various ores of tellurium. 5th 

 order : Aurets, containing electrum and auriferous silver. 6tk 

 order : Hydrargyrets, containing native amalgam. "Jth order : 

 Carbonates. Sth order: Muriates. — Iron Family. 1st order: 

 Native iron. 2d order : Sulphurets. 2d order : Carburets. 4th 

 order: Arseniets. Sth order : Tellurets. 6th order: Oxides, ytk 

 order: Sulphates. 8^/t o/rfer ; Phosphates, dtk order : Carhonates. 

 loth order: Arseniates. llth order: Chromates. 12ih order: 

 Tungstates. \3ih order: Siliciates. I4th order: Tantalates. 

 15/A order: Titaniates. IGth order: Hydrates. — Family of 

 Aluminium. Ist order: Sulphates. '2d order: Fluates. 3d 

 order: Fluo-siliciates. 4th order: Siliciates. 1*/ ivbdivision : 

 Single siliciates, comprehending nepheline, collyrite, &c. 2d 

 subdivision : Double siliciates, comprehending beryl, emerald, 

 Euclase ; mealy zeolite, lomonite ; harmotome, or cross-stone ; 

 mesotype, schorl ; felspar, lepidolite, leucite. Sd sr/bdivision : 

 Triple and complex siliciates, comprehending prehnite, koupholite, 

 mica. 



Five appendices are added to the dissertation itself. In the first, 

 Berzelius gives the ground of his calculations, as they have been 

 already explained in his paper. On the Cause of Cliemical Propor- 

 tions, printed in the second and third volumes of the Annals of 

 Philosophy. The second appendix exhibits the number of atoms 

 of oxygen existing in the various oxides. In the third appendix he 

 explains the different symbols which he employs in his discussions. 

 The fourth contains a valuable set of experiments on magnetic iron 

 ore, proving it to be a compound of black and red oxides of iron. 

 This valuable paper shall be inserted in a subsequent number of the 

 Annals. We shall likewise in a future number insert the fifth 

 appendix, in which Berzelius determines the proportion of oxygen 

 contained in glucina. 



