A16 
gives the results of investigations, both in this 
country and Europe, relative to the spruce and 
pine interests, and the insects predaceous and 
beneficial to them. 
Messrs D. AppLeTON & Co. announce the 
following new volumes in their library of ‘ Use- 
ful Stories :’ ‘The Living Machine,’ by Pro- 
fessor H. W. Conn; ‘The Alphabet,’ by Ed- 
ward Clodd and ‘Organic Chemistry,’ by Pro- 
fessor G. F. Chambers. 
THE continuation of several important publi- 
cations by The Macmillan Company, namely 
the second volume of the ‘ Scientific Papers,’ by 
John Couch Adam; the third volume of the 
text-books of ‘Embryology of Invertebrates,’ 
by Drs. E. Korschelt, K. Heider, and the 
‘second part of the translation of Professor Van 
Zittel’s text-book of paleontology. 
BOOKS RECEIVED. 
Liquefaction of Gases. WILLET L. HARDIN, New 
York and London. 1899. Pp. viii+ 250. $1.50. 
The Kinetic Theory of Gases. H. S. BURBURY, Cam- 
bridge. At the University Press. 1899. Pp. 
viii + 157. 
The History of the European Fauna. R. F. SCHARFF, 
London, Walter Scott, Ltd. 1899. Pp. 364. 
Untersuchungen wiber die Vermehrung der Laubmoose 
durch Brutorgane und Stecklinge. CARL CORRENS, 
Jena, Fisher. 1899. Pp. xxiv-+ 472. 15 Marks. 
Annuario publicado pelo observatorio do Reio de Janeiro, 
1899. Rio de Janeiro. L. MALAFAIA, JR. 1899. 
Pp. x + 318. 
Das Tierreich. 5 Lieferung, Sporozoa. ALPHONSE 
LABBeE. Berlin, Friedlander. 1899. Pp. xx-—+- 
180. Subscription price, 8.80 Mark. Single 
12 Mark. 
Catalogus Mammatium tam Owentum quam fossilium. E. 
L. TrRovEsSART. Fasciculus VI. Index, alpha- 
beticus, Berolini, Fiiedlander. 1899. Pp. 1265- 
1469. 
Electric Motive Power. ALBION T. SNELL. New 
York, D. Van Nostrand ; London, The Electrician 
Printing and Publishing Co., Ltd. 2d Edition. 
Pp. vi+ 403. $5.00. 
Methods of Knowledge. 
and London, 
Pp. xxii-++340. 
Hand-book of Optics. WiLL~tAmM Norwoop SUTER, 
New York and London, The Macmillan Company. 
1899. Pp. vili+209. $1.00. 
WALTER SMITH, New York 
The Macmillan Company. 1899. 
SCIENCE. 
[N. S. Vou. X. No. 247. 
Inorganic Chemical Preparations. FELIX LENGFELD. 
New York, The Macmillan Company. 1899. Pp. 
xviii-55. 
Nature Novitates. Berlin, Fredlander. 1898. Pp. 
780. 4 Mark. 
The University Geological Survey of Kansas, Vol. V. 
Special Report on Gypsum and Gypsum Cement 
Plasters. G. P. GRIMSLEY and E. H. 8. BAILEY, 
Topeka, J.S. Park. 1899. Pp. 83. 
Mineral Resources of Kansas. ERASMUS HAWORTH, 
Lawrence, University of Kansas. 1899. Pp. 128. 
Seatus Empiricus and Greek Scepticism. MARY MILLS 
PATRICK. Cambridge, Deighton, Bell & Co.; Lon- 
don, George Bell & Sons. 1899. Pp. viii-+ 163. 
SCIENTIFIC JOURNALS AND ARTICLES. 
American Chemical Journal, August. ‘On 
Nitromalonic Aldehyde’: By H. B. Hill and 
J. Torrey, Jr. ‘Contributions to the Study of 
Aqueous Solutions of Double Salts’: By H. 
C. Jones and N. Knight. The evidence is in 
favor of the view that the double chlorides 
exist as such in concentrated solutions and are 
only dissociated at great dilution. ‘On the 
Rearrangement of the Thiocarbamic Esters :’ 
By H. L. Wheeler and B. Barnes. ‘ Dimethyl- 
dianthracene, A Polymeric Modification of p- 
Methylanthracene’: By W. R. Orndorff and 
H. A. Megraw. ‘The Action of Chromic 
Acid on Hydrogen’: By C. L. Reese. Ex- 
periments carried out under various conditions 
and temperatures showed that hydrogen is 
oxidized only very slightly, if at all, below a 
temperature of 100°. ‘Action of Sulphuric 
Acid on Nitroheptane’: By R. A. Worstall. 
J. E.G. 
THE National Geographical Magazine for Sep- 
tember contains the following articles: 
The Commercial Development of Japan, by O. P. 
Austin. 
Bad Lands of South Dakota, by N. H. Darton. 
The West Indian Hurricane of August 7-14, 1899, 
by E. B. Garriott. 
The Return of Wellman, by J. Howard Gore. 
The International Cloud Work of the Weather 
Bureau, by Frank H. Bigelow. 
The number also contains several shorter 
articles, as ‘The Rediscovery of Porto Rico,’ 
‘Through Franz Josef Land,’ and ‘The Isth- 
mian Canal Route,’ besides a good deal of geo- 
graphic miscellanea. 
