Mineralogy and Geology. 425 
tion to the action of a current of chlorhydric acid gas. As a further 
perfecting of the method, he makes the vapor of water to react directly 
on the gaseous fluorid of titanium in a reducing or oxydizing atmosphere. 
For Anatase the fluorid of titanium is conducted along a platinum 
tube to the middle of a second platinum tube in which the vapor of 
water is passing. The tube isso heated that the fluorid and vapor of 
cadmium. Octahedral crystals are formed, having the angles of anatase, 
and a density between 3°7 and 3°9. 
The titanic acid takes the form and angles of Brookite in the presence 
of fluohydric acid when the temperature at which it is produced is be- 
tween that required for the volatilization of cadmium and that for zine. 
G.= 4:1—4°2. 
Rutile results when the fluorid of titanium and vapor of water are 
mixed at a bright red heat. The forms obtained are acicular square 
prisms with octahedral terminations. G.=4°3. 
In these reactions the fluohydriec acid acts the same part as the chlor- 
Ju 
3. Bishopville meteorite ; Chladnite.—The Bishopville meteorite, of 
#e 0:97, Mn 0-20, Mg 3-51, Oa 0:58 = 7-55, besides 0°8 loss by ignition. An 
- analysis of the residue afforded §i 60°86, Al 3-00, #e 0-31, Mg 34-48, Ca 0-11, 
Na 1-26, K 0-98=100-95. He concludes that in each case the material is 
only a mechanical mixture and not a chemical compound. 
He next divided the powdered stone by elutriation into a lighter (A) 
and a heavier (B) part, and analyzed them separately, hoping thereby to 
prove a like, or different, composition for the two. His results are : 
A. B. 
Silica, - - - - - 58°74 57-12 
Alumina, - = - - 16 > 
Sesquioxyd of iron and some Mn, 1:82 271 
Magnesia, - - - - 29°78 36-71 
Lime, : - - - - 1°70 1" 
Loss (alkalies), - - 1:80 
Rammelsberg concludes that the so-called chladnite is not a tri-silicate 
of magnesia, as made by Prof, C. U. Shepard in his analyses, but does not 
further educe the nature of the species. : : 
Dr. A. Kenngott, in his Uebersicht der Resultate Mineralogischer For- 
Smith appears to be owing to the fact that the latter, having a better 
Am. Jour. Sct.—Srconp Syrtes, Von. XXXVIII, No. 114.—Nov., 1864. 
