176 Dr. Flare on certain Points 



some plane, probably a. The planes of the crystal I have 

 measured are brilliant and perfect, several of the measured 

 angles having agreed exactly with the calculated ones. 



The muriate or chloride of lead occurs on r.iy specimen in 

 the form of very thin and irregularly curved translucent cry- 

 stals, without any well defined lateral or terminal planes. 

 The colour is yellowish white. 



The transparent and colourless crystals described as anti~ 

 monial phosphate of lead from Horhausen on the Rhine, have 

 the form and angular measurements of phosphato-arseniate of 

 lead; but on examination they appear to consist wholly of 

 chloride of lead, H. J. B. 



XXII. On certain Points of Chemical Philosophy and Nomen- 

 clature. By Robert Hare, M.D., Professor of Chemistry 

 fit the University of Pennsylvania ; with a Letter from 

 M. Berzelius. 



[To the Editors of the American Journal of Pharmacy. ,] 



Dear SlRS, Philadelphia, March 4, 183/. 



IN September, 1833, I published in your Journal, together 

 with some encomiums upon the Treatise of Chemistry by 

 the celebrated Berzelius, certain objections to his nomenclature, 

 and some suggestions respecting a substitute, which I deemed 

 to be preferable. In the following June I addressed a letter 

 to Professor Silliman upon the same topics, in which my cri- 

 ticisms and suggestions were amplified and corrected in obe- 

 dience to more mature reflection. A printed copy of that 

 letter having been sent by me to Berzelius, I received in an- 

 swer an epistle, of which I furnish you with a translation. 



and there are in other places, in Rutile, for example, impossible values of 

 angles given, through the inattention of the author in copying from his 

 rough memorandums, hut which a very slender knowledge of the subject 

 would have enabled the editor to set right. His omissions, however, in 

 this respect would be less injurious to the reputation of the author than 

 the altered and interpolated passages. In sulphuret of copper, for in- 

 stance, the author gives & regular six-sided prism, either simple or modified, 

 as the crystalline form, but the editor has inserted that the primary form 

 is a cube. Now an editor so little acquainted with mineralogy as not to 

 know that a cube cannot be the primary form of a regular six-sided prism, 

 ought not to have attempted any alteration in W. Phillips's text, but should 

 have reprinted it exactly as it stood, and have placed any additions of his 

 own in an appendix. 



* We reprint this article at the request of our friend Dr. Hare.— Edit. 



