MODELS OF CRYSTALS 



species he took less interest, though his observations here 

 were numerous and important." 



Before leaving Utica for his duties in New Haven, 

 Dana made a set of crystalline forms, in glass, and he 

 found it easy (as he says) with this material to represent 

 the primitive form within the secondary. About the 

 same time, he prepared an article on crystallographic 

 symbols, which was published in Silliman's Journal. 

 He also made out a nomenclature for minerals, analogous 

 to those in use in other branches of natural history, 

 which was read before the Lyceum of Natural History in 

 New York, and ordered to be printed in their Annals. 

 Further progress in the making of models is shown by 

 the following letter. 



TO HIS SISTER HARRIET 



" NEW HAVEN, CT., February, 1836. 



" Mr. Shepard, some five or six months since, asked 

 me whether I would not wish to propose myself as a can- 

 didate for one of two colleges, Dartmouth, N. H., or 

 Middlebury, Vt., and I believe my name was sent to the 

 former, although I hardly assented to it, and afterwards 

 expressed to him my disinclination to enter on the duties 

 of professor till some more preparation had been made. 

 I am glad that circumstances are as they are. Indeed 

 I think I have reason to be pleased that I have not been 

 engaged as Silliman's assistant this winter. 



" One important thing I have accomplished which I 

 think will be of great service to me, although I presume 

 it would not appear to you so important. I refer to the 

 reconstruction of my set of crystalline forms of glass. 

 My old ones are so inferior that I have entirely discarded 

 them. I have also made another set in conjunction with 

 a person lately appointed professor at Bristol College, 

 Pennsylvania, who has been working with me the few 

 weeks past, and this set has been sent to a store in New 

 York for sale. I did wish to find some one who would 

 engage in making them, agreeable to Professor Silliman's 



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