BAUSCH & LOMB 

 Projection Apparatus 



The moat complete lecture room projector 

 ever produced. Lantern slides and micro- 

 scopic objects shown consecutively without 

 change of light or recentering. 



Catalog C on request. 



BAUSCH & LOMB OPTICAL CO. 



Manufacturers 



Microscopes, Photographic Lenses and Shut- 

 ters, Eyeglass Lenses, Fiedl Glasses, etc. 



ROCHESTER, N. Y. 

 New York Chicago 



Boston San Francisco 



Frankfurt a/M Germany 



Talking Points for 



THE 

 POUR -TRACK 



NEWS 



Which Explain Its Emphatic Success 



Here are a few reasons why you want The 

 Four-Track News on the reading table In your 

 home. Look them over, think them over— then 

 send for a sample copy and see if you don't think 

 The Four-Track News is worth $1.00 a year to 

 yourself and your family. 



Its scope is confined to no geographical sec- 

 tion ; the world is its field. 



It instructs. 



It entertains. 



It's different. 



It is an universal favorite. 



It is always and forever up-to-date. 



It is a great help to students in history classes. 



There »8 much in every issue of educational 

 value to every reader. 



It is entertaining to the father and mother as 

 well as to the children. 



It is eloquent with bright, brief, valuable ar- 

 ticles and superb pictures. 



Subscriptions, $ 1.60 a Year; Foreign Countries, $1.50; 

 at N«ws-»tands, 10 Cents a Copy. 



A sample copy and our special terms to agents 

 will cost you nothing. Send your address and two 

 references to George H. Daniels, Publisher, 

 Room 114 A, 7 East 42d St., New York 



riETHODS IN PLANT HISTOLOGY 



Second Edition, Illustrated. Just Published. 

 By CHARLES J. CHAHBERLAIN, Instructor in Botany in the University of Chicago. 



The only book giving full directions for the collection and preparation of botanical material 

 for the microscope. The new and enlarged edition includes chapters on the Venetian turpentine 

 method, microchemical tests, free-hand sectioning, the use of the microscope, and the securing of 

 reproductive phases in the simpler forms of plant life. The book is indispensable for college 

 classes and will prove useful also to high-school teachers and amateurs. 



x + 262 pp., 8vo, cloth; net, $2.25 ; postpaid, $2.39 



A LABORATORY GUIDE IN BACTERIOLOGY 



For Students, Teachers and Practitioners. Illustrated. 



By PAUL Q. HElNEttANN, Fellow in Bacteriology, The University of Chicago. 



The directions are so full and clear as to offer no difficulty to those unacquainted with labora- 

 tory methods. The course as outlined includes all well-known pathogenic bacteria, as well as 

 methods for routine examination of air, water and milk, with practical dilution tables, appli- 

 cable also to serum work. The chapter treating of yeasts, molds, and torulae enables the in- 

 structor to select material for non-medical courses. There is also a list of recipes for special 

 culture media. 



" Undoubtedly any student who worked through this laboratory course would have a very 

 sound practical knowledge of the subject." — The Lancet (London). 



vii+ 143pp., 12mo, cloth; net, $1.50 ; postpaid, $1.61 



THE UNIVERSITY OF CHICAGO PRESS 



Address Department 33. 



CHICAGO and NEW YORK. 



