472 Scientific Intelligence. 
“Somewhat doubtful is the exact quantity of fluorine which it 
contains. Mr. Mackintosh determined its quantity from the excess 
of lime which he found. A determination which I have made in 
the same manner gave me a far lower result, instead of 11°32, only 
8-93 percent. My direct fluorine deter mination is probably too red 
owing to the incomplete decomposition of the mineral by fus 
with silica and sodium carbonate and the difficulties in the cide 
ration of fluorine from such a welt tion doubt also exists as to 
the 0°61 per cent loss by fusion with plumbie a whether it is 
water or lead fluoride. As all my material was used up I could 
ra attempt any other determination for dededg up these doubt- 
ul points 
“It is to be regretted that the results of Dr. Winkler’s two 
analyses are so very unsatisfactory, and that he has sacrificed the 
very precious Ehrenfriedersdort tie ite by employing incorrect 
methods for his analyses. nition he has volatilized the 
greater poe of the ene te aici by evaporation with nitric 
more left than sufficient to give a doubtful reaction. * 
“Dr. Winkler does not state that he has tested hie soca 
alumina for its purity, which is unfortunate, or he wo 
gee that a slight trace of it might have been present, Wil that 
e precipitate was nearl ure glucina. here can be very 
little doubt that the Ehrensfriedersdorf and Stoneham mineral 
are identical in composition. There is also a larger percentage of 
ferric oxide in Dr. Winkler’s analysis than found by me. Might 
this not have come from the molybdie acid which he used? The 
ammonium molybdate—prepared from Merk’s molybdic rg 
which I use contains in 100°, 0-002 grms. ferric oxide. 
measured quantities a cor responding amount of ferric mt Pie oak 
ted.” 
deduce 
Ill. Botany Anp Zoo.Loey. 
1. Catalogue of the Flora of Minnesota; by Warren Uru 
Part VI of Report of Progress of the Geological et Natural 
istory Buea | of Minnesota, N. H. Winchell, State Geologist. 
Minneapolis. 1884. pp. 193, 8vo.—* Minnesota lies in the middle 
of the North American Continent, almost midway between the 
Atlantic and Pacific oceans and between the Gulf of Mexico and 
the Arctic Ocean, being distant a thousand miles or more from 
each of these grand bodies of water. . It lies between 43° 30” 
and 49° north latitude, and between 1 90° and o7° west longitude. 
Its area is 84,286 square miles.” “A moderately undulating 
ountry” on the whole, with an average elevation of about 1 5275 
not far from that lake, which exceeds 2000 feet, while Itasca 
Lake, the head of the Mississippi, is about 1500 feet above the 
