In =Astronomy=, Dr. Simon Newcomb’s new book, published October, 1900; in =Physics=, the Johns Hopkins text of Professors Rowland and Ames; also in Physics for second and third year high school work, the text of Dr. Hoadley, of Swarthmore; in =Physiology=, the text by Drs. Macy and Norris, based on the Nervous System; also the =High School Physiology= indorsed by the W. C. T. U., written by Drs. Hewes., of Harvard University; in =Geology=, the =Revised= “=Compend=” of Dr. Le Conte, and the two standard works of Dana,—The =Manual for University Work=, and the =New Text Book=, revision and rewriting of Dr. Rice, for fourth year high school work; in =Chemistry=, the approved =Storer and Lindsay=, recommended for secondary schools by the leading colleges; in =Zoology=, the =Laboratory Manual= of Dr. Needham, of Cornell; and the series “=Scientific Memoirs=” edited by Dr. Ames, of John Hopkins. Nine volumes ready. The publishers cordially invite correspondence. AMERICAN BOOK COMPANY, CINCINNATI Transcriber’s Notes pg 124 Changed Semi-diagramatic to: Semi-diagrammatic pg 126 Assumed reduced to 2-5 to mean: ⅖ pg 128 Removed duplicate word of: vessel of of suitable pg 130 Changed the Ohio Naturalist. to: The Ohio Naturalist pg 131 Added comma after: Engineering, Pharmacy pg 131 Added period after: Keys simple. pg 132 Added period after: David S. Jordan M. D Table of Contents capitalization and punctuation left as written- does not match chapter headings