Annual Meeting.] 



346 



[May 2, 



lection. This is followed by the compounds ; these fill the wall 

 cases on the remaining sides of the room, and part of the gallery. 

 Here we exhibit the different species of minerals, arranged in 

 their proper order as classified by Prof. Dana, with some slight 

 changes in the succession of some of the larger divisions. 



Models of the principal, or most characteristic crystalline forms 

 of each important species have been made out of plaster, and the 

 surface hardened with paraffine in order to give a smooth finish. 

 These are mounted upon wood, or tablets painted blue, in the 

 same manner as the substances whose structure they are used to 

 illustrate. It was found by experiment, that the best results 

 were obtained by leaving these models of crystals uncolored. 



The following is the report made upon the number of species 

 and specimens in each part of the collections, and also serves to 

 show the order of arrangement. 



MINERALS. 



COMPARATIVE COLLECTION. 



202 species. 792 specimens. 136 models. 



SYNOPTICAL COLLECTION. 



164 species. 180 specimens. 



SYSTEMATIC COLLECTION. 



Native elements 21 species. 156 specimens. 14 models. 



Sulphides, Arsenides, etc. . . .44 " 279 " 46 " 



Sulpharsenites, Sulphantimonites etc. . 17 " 37 " 6 " 



Chlorides, Bromides and Iodides . .10 " 26 " 7 " 



Fluorides 5 " 86 " 5 " 



Oxides 45 " 701 " 13 " 



Chromates, Columbates, Tantalates, etc. . 12 " 21 " 9 -" 



Arsenates, Vanadates, Phosphates, etc. . 47 " 121 " 28 " 



Nitrates, Borates, Tungstates, etc. . .10 " 32 " 14 " 



Sulphates 24 " 197 " 25 " 



Carbonates 23 " 300 " 44 " 



Silicates 146 " 1046 " 123 " 



Hydrocarbons 8 " 20 " 1 " 



Sum total of Systematic Collection . 412 species. 3022 specimens .335 models. 



Geology. 



This collection could not be finished for a final report as was 

 anticipated ; time failed us, and during the coming year it is prob- 

 able that there will be a still greater and more substantial obstacle. 



