852 The American Naturalist. [October, 
tabular, both of which are rich in forms. Two new planes }P® and 
2P raise the number of forms known to occur in the species to 75. 
In the carbonaceous mica schists near the contact with granite in 
the Miiglitzthal, S. E. of Dresden, Beck has discovered small crys- 
tals of brookite. The original rock from which the schists were made 
contained rutile needles. These afforded the material for the brook- 
ites, which are found lying with their flat sides parallel to the cleavage 
planes of the schists. 
The striations parallel with and perpendicular to the octahedral 
edges of the magnetite crystals from Mineville, N. Y., are ascribed by 
Kemp” to etching agents. The striations parallel to the edges are 
usually referred to twinning, but in the present case it is probable that 
Kemp’s explanation is the correct one, for when unstriated crystals 
are subjected to the influence of HCl and H,SO, they become covered 
with striations like those occurring in nature. 
A lot of very pure cordierite from coarse veins cutting gneiss at 
Guilford, Ct., has been analyzed by Farrington,” who finds in it: 
SiO, AlO, FeO, FeO MnO MgO H,O 
49.44 3297 .35 5.11 32 10.39 1.65 
corresponding to H,O, 4(Mg Fe)O, 4 A1,0, 10 SiO, 
Treadwell” has made a new analysis of milarite that yielded him: 
SiO, AlO, CaO K,O NaO H,O MgO 
72.79 10.12 11.32 432 26 1.19° tr. 
This corresponds to R,O, 2 CaO, Al,O,, 12 SiO,. 
Scalenohedral and prismatic crystals of calcite from Niederraben- 
stein, in Saxony, are described by Beckenkamp.” The prismatic ones 
are tetartohedral and hemimorphic. 
Miscellaneous.—Dunnington, 2 after careful quantitative analy- 
ses of seventy-two soils from various localities as widely separated as 
the Sandwich Islands and Palestine, comes to the- conclusion that all 
18Neues Jahrb. f. Min., etc., 1892, i, p. 159. 
9Zeits. f. Kryst., xix, p. 198. 
Amer. Jour. Sci., Jan., 1892, p. 13. 
Neues Jahrb. f. Min., etc., 1892, i bP. 167. 
“Zeits. f. Kryst., xx, p. 163. 
2 Amer. Jour. Sci., Dec., 1891, p. 491. 
