572 General Notes. . [June 
are introduced and calculations are made in full, just as in ordi- 
naturally merits as being the method which is now almost uni- 
versally used by the most eminent crystallographers. 
_ Among the publications of the last few months which contain 
more or less of interest in mineralogy and petrography may be 
mentioned— 
Professor A. Kenngott, M.D.—Handworterbuch der Mineralo- 
gie, aeons und Palacontologie, It. Breslau, 1887. Eduard 
Trew 
Dr. ya ‘Rieman. —Taschenbuch für Mineralogen. Berlin, 1887. 
H Sprogs 
Tou G- Aliaemiogische und petrographische Tabellen. 
biae Freytag. 
. Dana.— Manual of rst hg ck = Petrography* 4th ed., 
1887. New York: John Wiley & Son 
Professor W. O. Crosby.—Tables for the Determination of 
Common Minerals, chiefly by the Physical Properties, with con- 
firmatory Chemical Tests.” Boston, 1887. A. Crosby. 
Professor A. H. Che ster.—Catalogu ue of Minerals ‘Alphabeti- 
cally Arranged, with their Chemical Composition and Synonyms.’ 
Mew York: 1886. John Wiley & Sons. 
ae Sierry Hunt—Mineral Physiology and Physiography.? 
Boston, 1886. S. E. Cassino. 
' Professor W. O. Crosby.—Geological Collections. Mineralogy. 
ton Soc. Nat. History, 1386. 
A. C. Lawson.—Report on the Geology of the Lake of the 
Woods Region. Part CC. Annual Report of the Geological 
and Natural wage Sie of Canada. Montreal, 1885. 
= C. D. Lawton.—Mineral Resources of Michigan for 1885. By 
authority. Tanas 1886. Thorp & Godfrey. 
Mineral Resources of the United States for 1885. Washing- 
ton, 1886. Government Printing Office 
` Dr. P. Groth.—Grundriss der Edelsteinkunde. Leipzig, 1887. 
Engel mann. 
BOTANY. 
: A Couple of Botanical Estrays.—A botanical discovery of 
_ Some interest has recently been made in the neighborhood of 
a - Towa ree Two species of Lycopodium have been found. So. 
- far as the writer can learn, this is the first record of such plants 
n within the limits of Iowa. Lycopodium ag been so p in all 
* Reviewed in Science, 1887, p. 304. 
_ ® Reviewed in Science, February, 1887, p. 
= Edited by Prof. Cuan E. BESSEY, ea i ; 
