GEOLOGICALSOCIET Y. 



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age, and those which have a long or macro- diagonal 

 one, besides those which have both. 



Blende, spathic iron, dolomite &c. wanted no syno- 

 nymes, being too w T ell known, but synonymes were ne- 

 cessary for the Willemite, or silicato carbonated cala- 

 mine, Poonahlite, or Mesotype, the Dysluit or Pleo- 

 naste, Peritomous lead-baryte, Peganite, &c. &c. the 

 poor student has too much to embarrass him already, 

 let him not be incumbered with the names in addition. 



I am not partial to the disposition of flies, which at- 

 tracts them only to rottenness : it is not the fault of 

 the author, whose treatise is in general, very correct- 

 ly written \ it is the difficulty of the subject, which 

 as I said in the beginning, it is very laudable to have 

 endeavored to enlighten, — and I must confess, that I 

 by no means, dislike the third catalogue, arranged ac- 

 cording to the gradual increment of hardness, but 

 with the addition of cleavage, and crystals. I partake 

 with the author the great desire to simplify the study 

 of mineralogy, but I prefer the means proposed by 

 Moh's and Breithaupt, especially the last, published 

 in 1832, and which translated by me from the German, 

 I submit to the judgment of the society. Their clas- 

 ses and orders are not to be thrown away when the 

 building is finished. It must be understood that the 

 scale of hardness of Breithaupt is two degrees greater, 

 than that of Moh's, and I think that the third and the 

 seventh degrees are appropriately inserted. 



The scale is as follows. 



