HENRY HOLT 6* CO.'S WORKS ON SCIENCE. 



Packard's Guide to the Study of Insects, and a Treatise on those 

 Injurious and Beneficial to Crops. For Colleges, Farm-schools, 

 and Agriculturists. By A. S. Packard. With 15 plates and 

 670 wood-cuts. Ninth Edition. 715 pp. 8vo. $4.50 net. 



Outlines of Comparative Embryology. Illustrated. 243 pp. 8vo. 



$2.00 net. 



Zoologies. See American Science Series. 



Peabody's Laboratory Exercises in Anatomy and Physiology. By Jas. 

 Edward Peabody, of the High School for Boys and Girls, 

 New York, x -J- 79 pp. Interleaved. i2mo. 60c.net. 



Perkins's Outlines of Electricity and Magnetism. By Prof. Chas. A 

 Perkins, of the University of Tennessee. 277 pp. i2mo. 

 $1.10 net. 



Pierce's Problems in Elementary Physics. Chiefly numerical. By E. 

 Dana Pierce, of the Hotchkiss School. 194 pp. 60c. net. 



* Price's The Fern Collector's Handbook and Herbarium. By Miss Sadie 

 F. Price. 72 plates, mostly life-size, with guide. 4to. $2.25. 



Randolph's Laboratory Directions in General Biology. 163 pp. 80c. net. 



Remsen's Chemistries. See American Science Series. 



Scudder's Butterflies. By S. H. Scudder. 322 pp. i2mo. $1.20 net. 



Brief Guide to the Commoner Butterflies, xi -f- 206 pp. $1.25. 



The same. With 2 1 plates, containing 97 illustrations. $1.50. 



The Life of a Butterfly. A Chapter in Natural History for the 



General Reader. By S. H. Scudder. 186 pp. i6mo. 80c. net. 

 Sedgwick and Wilson's Biology. See American Science Series. 

 *Step's Plant Life. Popular Papers. Illustrated. 218 pp. $100 net. 

 Torrey's Elementary Studies in Chemistry. By Joseph Torrey, Jr., 



Instructor in Harvard. 4S7 pp. $1.25 net. 

 Underwood's Our Native Ferns and their Allies. By Prof. Lucien M. 



Underwood, of Columbia. 156 pp. $1.00 net. 

 Underwood's Moulds, Mildews, and Mushrooms. JlVd. 236 pp. $1.50 net. 

 Williams's Elements of Crystallography. By George Huntington 



Williams, late Professor in the Johns Hopkins University. 



x -)- 270 pp. Revised and Enlarged. $1.25 net. 

 Williams's Geological Biology. An Introduction to the Geological 



History of Organisms. By Henry S. Williams, Professor of 



Geology in Yale College. 8vo. 395 pp. $2.80 net. 

 WoodhulPs First Course in Science. By John F. Woodhull, Pro- 

 fessor in the Teachers' College, New York City. 



/. Book of Experiments, xiv + 79 pp. 8vo. Paper. 50c. net. 

 II. Text-Book, xv -\- 133 pp. i2mo. Cloth. 65c. net. 

 Woodhull and Van Arsdale's Chemical Experiments. An elementary 



manual, largely devoted to the chemistry of every-day life. 



Interleaved. 136 pp. 60c. net. 

 Zimmermann's Botanical Microtechnique. Translated by James Ellis 



Humphrey, S. C. xii -f- 296 pp. 8vo. $2.50 net. 



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 m, 1900 



