SCIENC 
NEw SERIES. SINGLE COPIES, 15 cts, 
VOL. XIII. No. 326. FRIDAY, Marcu 29, 1901. ANNUAL SUBSCRIPTION, $5.00, 
Estate ALFRED HAFNER 
GUSTAV E. STECHERT G . ‘ & ECI ER J 
9 East 16th Street, New York 
BOOKS and PERIODICALS NEW and SECOND-HAND 
SUBSCRIPTIONS TAKEN FOR ALI, PERIODICALS. 
WHOLE LIBRARIES OR SMALL LOTS OF BOOKS PURCHASED 
Large Stock of Complete Sets of Scientific Periodicals. 
SEND FOR CATALOGUE. 
MONTHLY LIST of new publications in various languages sent to customers gratis upon request. 
All important German and French books on hand as soon as published. Books in any language not in 
stock, imported at shortest notice either in our regular weekly shipments or if necessary by post. 
ATTENTION IS DIRECTED TO THE FOLLOWING RECENT PUBLICATIONS: 
KOENIG, Dr. J., Die Verunreinigung der Gewaesser, deren schaedliche Folgen sowie die Reini- 
gung von Trink und Schmutzwasser, 2 vols. with 256 illustrations and 7 lithographic plates, 
bound in cloth, 1899. $7.16 
TSCHIRCH, A., Die Harze und die Harzbehaelter. Historisch—-Kritische und Experimentelle 
in Gemeinschaft mit Zahlreichen Mitarbeitern Ausgefuehrte Untersuchungen. With 6 plates, 
1900. 4 mor. $5.00 
WEBER, HEINRICH, Die Partiellen Differential=Gleichungen der Mathematischen Physik. 
Nach Riemann’s Vorlesungen, Vol. I., 1900. 4 mor. $2.90 
WEINSTEIN, Prof. Dr. B., Thermodynamik und Kinetik der Koerper. Vol. I.: Allgemeine 
Thermodynamik und Kinetik und Theorie der Idealen und Wirklichen Gase und Daempfe. 
1901. 4mor. $3.60 
VIVAREZ, H., Les Phénomenes Electriques et Leurs Applications ; Etude historique tech- 
nique et économique des Transformations de l’Hnergie électrique. 1901. Cloth, net, $3.00 
BINET, Alfred, La Suggestibilité. With 32 illustrations and 2 plates. 1900. Cloth, net, $2.40 
(A volume of the Bibliothéque de Pédagogie et de Psychologie. ) - 
We have on hand among other sets of periodicals the following which are extremely rare: 
LONDON, EDINBURGH & DUBLIN FLLOSOPHICAL MAGAZINE from its commencement in 1798 to 1900, 216 vols, 
newly bound in 44 green morocco, uniform, $875. 
The QUARTERLY JOURNAL OF MICROSCOPICAL SCIENCE edited by Lankester, Busk, Dyer, Klein, Moseley and 
Sedgwick. First Series 8 vols. and New Series 29 vols. London 1853-1889, 37 vols. in uniform 4 calf binding, $325. 
The years from 1890 to date can all be obtained new from the publishers and we can complete the set as far as it 
should be wanted. 
ANNALS AND MAGAZINE OF NATURAL HISTORY conriebne, of the MAGAZINE of ZOOLOGY AND BOTANY, 
edited by Jardine, Selden & Johnston, 2 vols. 1837-38, and ANNALS AND MAGAZINE OF NATURAL HISTORY edited 
by Jardine, Selby & Hooker, polled 1-5 and Series 6, yols. 1-4, complete from beginning 1838 to 1889, together 106 yols. in uni, 
form 4 morocco binding, $300 
Any of the years from 1890 to date can be supplied promptly in the same binding. 
We shall shortly issue a catalogue of our large stock of second-hand books on Natural History, including Astronomy, 
Geology, Mathematics, etc. If you are not already receiving our catalogues please to send us your name that we may send 
you the above catalogue as soon as it isready. 
G. BE. STECHERT, 9 East 16th St., New York 
