Notices respecting New Books. 211 



and of chemical homology, of solution, and those of polymerization 

 or rather of intrinsic condensation, and the relation of condensa- 

 tion to hardness and to chemical indifference, have therefore been 

 dwelt upon at some length. The problem of determining the 

 co-efficient of condensation in liquid and solid species has moreover 

 been discussed in a separate chapter ; while a new and simplified 

 chemical notation, which is believed to be advantageous for the 

 purposes of the mineralogist, has been set forth. The subject of 

 mineral constitution, and the theoretical questions therein involved, 

 are treated in Chapter X." 



A new mineral ogical classification is propounded in Chapter XI. , 

 the mineral kingdom being divided on chemical grounds into four 

 classes : — I. Metallaceae ; II. Halidaceae ; III. Oxydaceae ; IV. 

 Pyricaustaceae. 



The Metallaceae comprise the non-oxydized metalline minerals, 

 including the metals, their alloys and all their compounds with 

 sulphur, selenium, tellurium, phosphorus, arsenic, antimony, and 

 bismuth. The resemblance, it is noted, between the typical and 

 malleable metals, such as gold, silver, lead, copper, nickel, and 

 iron, and the elementary metalline species, tellurium, arsenic, 

 antimony, and bismuth, are such, Dr. Hunt states, that the com- 

 pounds of these with the metals above named cannot well be 

 separated from alloys. In this Class the author enumerates 22 

 genera with 167 species with latin names either indicative of their 

 composition, or having reference to their common accepted names. 

 Subclass A consists of the Metalloinetallata. Order I. Metal- 

 linea ; Genus 1. MetaUum, native metals and alloys ; 2. Metallinum, 

 semimetals. Order II. Galeninea ; Genus 1. Thiog olenites, metallic 

 sulphids ; 2. Salenogalenites, metallic selenids ; 3. Tellurogalenites, 

 metallic tellurids. Order III. Diaphorinea; Genus 1. Arsenodia- 

 phorites, metallic sulpharsenids ; 2. Stibiodiaphorites, metallic 

 sulphantimonids ; 3. BismutodiapTiorites, metallic sulphobismu- 

 thids. Order IV. Pyritinea ; Genus 1. Pyrites, metallic sulphids 

 (of iron, cobalt, nickel, copper, chromium, and ruthenium, having 

 a hardness above 5 of Mohs' scale) ; 2. Pyritinus, metallic sul- 

 phids (iron, nickel, copper, and tin with hardness from 3*5 

 to 5). Order V. Chloanthinea ; Genus 1. Phosphocloanthites, a 

 metallic phosphid ; 2. Arsenocldoanthites y metallic arsenids ; 3. 

 Stibiochloanthites, metallic antimonids ; 4. Arsenodyscrasites, metal- 

 lic arsenids ; 5. Stibiodyscrasites, metallic antimonids. Order VI. 

 Lamprotinea; Genus 1. Arsenolamprotites, metallic sulpharsenids ; 

 2. Mesolamprotites, &c, kindred to the preceding genus (with 

 nickel, antimony, bismuth). Subclass B. Spathometallata. Or- 

 der VII. Spathometallinea ; Genus 1. Spaihometallinum, spatho- 

 metalloids (sulphur, selenium, selensulphur, phosphorus, arsenic). 

 Order VIII. Sphalerinea ; Genus 1. Sphalerites, spathoid sulphids. 

 Order IX. Ehopyritinea ; Genus 1. Arsenofulvites, spathoid sul- 

 pharsenids ; 2. Stibiofulvites, spathoid sulphantimonids ; 3. Media- 

 fulvites, kindred to last two genera (annivite, studerite, rittingerite, 

 &c.). Class II. Halidaceae, with 21 species in 5 genera. Order I. 



