224 



" grease bushes." Dr. Jackson also gave an analysis of a bottle 

 of water from a Hot Spring which issues from a Sandstone hill 

 two or three thousand feet high in the same region, with a tem- 

 perature 108° F. One pint contained 44 grains of solid matter, 

 as follows : — 



44.000 



This water is a very agreeable saline spring, containing, when 

 fresh, a little sulphuric and carbonic acid gas. The above 

 specimens and statements concerning them were sent to Dr. 

 Jackson by Dr. Bernhisel of the Mormon settlements. 



Dr. Jackson likewise communicated the fact that the plumba- 

 ginous mica slates of Vermont contain a considerable portion of tin 

 diffused through their mass in a state of combination not yet de- 

 termined. The specimens received were from two localities, and 

 yielded a considerable quantity of an alloy of tin and iron when 

 fused in a crucible lined with lampblack. Specimens of the rock 

 were exhibited, with globules of the metal extracted from it. This 

 discovery is an important one, as it points to the probable occur- 

 rence of tin ores in districts where they were never suspected to 

 exist. For if an extensive rock formation is filled with tin in 

 some state of combination, veins of the oxide or sulphuret can- 

 not fail to exist somewhere in its mass. Pieces of plumbaginous 

 slate so full of graphite as to prove valuable as plumbago have 

 been recently assayed by Mr. Richard Crossley in Dr. Jack- 

 son's laboratory, and malleable grains of an alloy of tin and iron 

 have been obtained. 



