HENRY HOLT <& 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 ?/ t '/. 



Outlines of Comparative Embryology. By A. S. PACKARD. Copi- 

 ously illustrated. 243 pp. 8vo. $2.00 net. 



Zoologies. See American Science Series. 



Perkins's Outlines of Electricity and Magnetism. By CHAS. A. PERKINS, 

 Profesr"- in 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. i2mo. 

 6oc. net. 



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



F. PRICE. With 72 plates. {November, 1896.) 



Remsen's Chemistries. See American Science Series. 



Scudder's Butterflies. By SAMUEL H. SCUDDER. x + 322 pp. i2mo. 

 $1.20 net. 



Brief Guide to the Commoner Butterflies. By SAMUEL H. SCUDDER. 



xi -j- 206 pp. I2mo. $1.00 net. 



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



General Reader. By S. H. SCUDDER. 186 pp. i6mo. Soc. net. 



Sedgwick r.nd Wilson's Biology. See American Science Series. 



*Step's Plant Life. By EDWARD STEP. Popular Papers on the 

 Phenomena of Botany. i2mo. 148 Illustrations. $1.00 net. 



Underwood's Our Native Ferns and their Allies. By LUCIEN M. UNDER- 

 WOOD, Professor in DePauw University. Revised. 156 pp. 

 121110. 1.00 net. 



Williams's Elements of Crystallography. By GEORGE HUNTINGTON 

 WILLIAMS, late Professor in the Johns Hopkins University, 

 x -f- 2 7 PP- ismo. 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. 



Woodhull's First Course in Science. By JOHN F. WOODHULL, Pro- 

 fessor in the Teachers' College, New York City. 



/. Book of Experiments, xiv -f- 79 pp. Svo. Paper. SQC. net. 

 IT. Text-Book, xv + 133 pp. I2mo. Cloth. 6sc. net. 

 III. Box of Apparatus. ?2.oo net (actual cost to the publishers}. 



Zimmermann's Botanical Microtechnique. Translated by JAMES ELLIS 

 HUMPHREY, S.C. xii + 296 pp. Svo. $2.50 net. 



HENRY HOLT & CO., 29 WEST 230 ST., NEW YORK. 



