4:4-2 Report of the Transactions of the Academy of 



line form of the andaliisite. It occurs in a specimen from 

 Litchfield in Connecticut, The jwogressive, as our author 

 terms this variety, is described as a six-sided prism, having 

 four emarginated edges terminated by a dihedral summit. 



Dr. Troost's last memoir, which is still in the hands of the 

 Committeeof Examination, contains observations on the mi- 

 nerals discovered at Franklin, New Jersey. 



Mr. Bowen has furnished the Academy with two communi- 

 cations, one of which is-an analysis of a copper ore, which ap- 

 pears to be a bisilicate of copper with water, and which oc- 

 curs at Somerville in New Jersey. Mr. Bowen's analysis 

 proves the absence of phosphoric acid, which had been sup- 

 posed to be one of the ingredients of this mineral. 



A mineral which was discovered by Dr. M'Clellan at Say^ 

 brook, in Connecticut, in 1817, has been examined by Mr. 

 Bowen, and proved to be new : he has dedicated it to Pro- 

 fessor Silliman. It bears some analogy to anthophyllite, 

 and was described under that name in Cleaveland's second 

 edition. It occurs in rhomboidal prisms, and has but one 

 cleavage parallel to the longer diagonal. Its analysis proves 

 it to be a silicate of alumine, with an accideritail portion of 

 oxide of iron. 



The experiments which Professor Silliman has made on 

 charcoal are well known, and have excited much interest, and 

 some division of opinion, both abroad and at home. They 

 liave been repeated by several chemists, and among others 

 by Dr. Macneven of New York, who obtained, by means of 

 Dr. Hare's deflagrator, a globule, which has since been ex- 

 amined by Mr. Vanuxem, who has communicated his results 

 to the Academy. After an analysis of the same. Professor 

 Vanuxem concludes " that this product of the fusion of char- 

 coal must consist merely of the impurities contained in the char- 

 coal, and is not a fusion of its carbon as has been supposed." 



This communication led to a reply from Dr. Hare, whose 

 object was to prove that the substance examined by Mr. Van- 

 uxem differed materially from the products obtained by Mr. 

 Silliman, and that the conclusions drawn from the former 

 were inapplicable to the latter. In this state the question now 

 stands ; and we shall forbear offering any remarks, as the Aca- 

 demy has appointed a committee of its members to repeat the 

 experiments, and ascertain the facts*. 



Finally, a communication has been received from Messrs. 

 Vanuxem and Keating, containing some observations on the 

 minerals discovered at Franklin, New Jersey. In this paper 



* Sec Phil. Mag. vol. Ixiv. 467, Ixv. 283, Ixvi. 161 and 455. 



the 



