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BOTANY and ZOOLOGY 



CAMPBELL. The Structure and Development of flosses and Ferns (Archegoniatae). 



By Douglas Houghton Campbell, Stanford University. Second Edition. Thoroughly 

 Revised. With considerable additional matter. 657 p., 8vo, il., cl., §4-50 net. 



HARWOOD, W. S. New Creations in Plant Life. An Authoritative Account of the Life and 

 Work of Luther Burbank. With Illustrations. 14 -|- 368 p., 12mo, $1.75 net (postage 13c. ). 



PHYSICAL SCIENCE 



CLERKE. The System of the Stars. By Agnes M. Clerke, Honorary Member of the Royal 

 Astronomical Society, Author of " History of Astronomy During the Nineteenth Century'' 

 and "Problems in Astro-Physics." Second Edition, thoroughly revised, with the recasting 

 of old material and the addition of new. Cloth, 8vo, 403 p., $6.50 net. 



RIES. Economic Geology of the United States. By Heinrich Ries, Ph.D., Assistant Pro- 

 fessor of Economic Geology at Cornell University. Cloth, 8vo, 435 p., $2.60 net 



ROLFE. The Polariscope in the Chemical Laboratory. An Introduction to Potarimetry 

 and Its Applications. By George William Rolfe, A.M., Instructor in Sugar Analysis in the 

 Massachusetts Institute of Technology. Cloth, 12mo, 312 p.. $1.90 net. 



ROSCOE and SCHORLEMMER. Treatise on Chemistry. Volume 1. Non-Metallic 

 Elements. New Edition completely Revised by Sir H. E. Roscoe assisted by Drs. H. G. 

 Colman and A. Harden. Cloth, 8v , 931 p., $5.00 net. 



RUTHERFORD. Radio-Activity. By E. Rutherford, D.Sc, F.R.S., F.R.S.C., Macdonald 

 Professor of Physics, McGill University, Montreal. Second Edition, with much additional 

 matter. Cloth, 8vo, 580 p., $4.00 net. 



SCHNABEL. Hand-Book of fletallurgy. By C. Schnabel. Translated by Professor H. 

 Louis. New Edition. In Two Volumes. Vol. I., new edition. Cloth, 8vo, $6.50 net. 



SCHULTZ and JULIUS. A Systematic Survey of the Organic Colouring Matters. 



Founded on the German of Drs. G. Schultz and P. Julius. Second Edition, Revised 

 Throughout and Greatly Enlarged by Arthur G. Green, F.l.C, F.C.S. 



10 + 280 p., Imperial 8vo, el., $7.00- 



TALBOT and BLANCHARD. The Electrolytic Dissociation Theory, with Some of 

 Its Applications. An Elementary Treatise for the Use of Students of Chemistry. By 

 Henry P. Talbot, Ph.D., and Arthur A. Blanchard, Ph.D., Mass. Inst, of Technology. 



5 + 84 p., 8vo, cl. , $1.25 net. 



THORP. Outlines of Industrial Chemistry. A Text Book for Students. By Frank Hall 

 Thorp, Ph.D., of the Massachusetts Institute of Technology. Revised Edition. Including a 

 Chapter on Metallurgy, by Charles D. Dkmond. 618 p., cl., 8vo, $3.50 net. 



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