Trans. X. V. Ac. Sci. 8 Oct. 24, 



On Anthracite Creek are found many thousand acres of anthracite of 

 better quahty than that of Pennsylvania. Recent analysis made at the 

 School of Mines, New York, shows it to contain less than one per cent, 

 of sulphur, and three per cent, of ash. 



The forest vegetation of Colorado is ver}- simple. The pinion or nut 

 pine is very common, also the yellow pine {P. ponderosa), Douglas' 

 spruce, Menzies' spruce, etc. In the mountains the general vegetation 

 is picturesque but not so varied as in the lowlands. The following 

 plants are among the most characteristic in the lowlands of Colorado 

 and Utah. 



The evening primrose {CEno/ksra Ccespitosa), with its large beautiful 

 white flowers. 



The wild tobacco {Nicotiana attcnuata). 



The sun flower {Helianthus). 



The bee flower {Cleome integrifolid), presenting purple acres by the 

 roadside, and the yellow species (C luted) less common. 



The American primrose {Primula Parryi). 



The pasque flower {Anemone patens, Var. Nuttalliand). 



The Eriogonums, about twenty species, coloring whole mountain 

 sides yellow. 



The Oregon grape {Bcrberis aqidfolium'). 



Phacelia circinata, in tufts of purple flowers on rocky slopes. 



The lily {Calochortus Gunnisoni and C. Xuttalli), pr " black-eyed 

 Susan " (Indian — " Seego "), very plenty in the moister portion of the 

 sage-plains. 



The clematis {Anejnone alpma), with its purple flowers. 



The penstemons, of which 20 or 30 species are peculiar to that 



county, deep crimson, pink, and purple and blue in color, often very 



showy, and so abundant that whole acres of ground are colored by 



them. 



The columbine {Aquilegia canadensis), and also a much larger 



species {A. cerulea), clothing the mountains of Colorado and Utah, 



with blue, cream-colored, and white flowers. A large number of dried 



plants were exhibited from a collection of several hundred species just 



brought on from Colorado, with collections procured from Prof. Marcus 



Jones of Salt Lake City, and others. 



October 24, 1881. 

 Section of Physics. 

 Vice-president, Dr. B. N. Martin, in the Chair. 

 Thirty-one persons present. 



Mr. W. Le Conte Stevens read a paper, of which the following 

 is an abstract. 



