Zoological and Botanical Supplies — All Kinds 
Biological Specimens— Every Description 
Instruments for Plant Physiology 
Field and Herbarium Equipment 
of Standard Stock 
Driers, Mounting Papers, Qenus Covers, Plant Presses 
{Samples of Paper Mailed on Request) 
Microscopical Accessories of Highest Grade 
COMPLETE LABORATORY EQUIPMENT— Physics, Chemistry, Botany 
CAMBRIDGE BOTANICAL SUPPLY COMPANY 
3 Lexington Street WAVERLEY, MASS. 
HUGO DE VRIES 
Species and Varieties, Their Origin by Mutation 
Edited by D. T. MacDougal. $5.00. 
Plant- Breeding 
Comments on the Experiments of Nilsson and Burbank. Illustrated. 
Cloth, gilt, $1.50. 
The Mutation Theory 
Experiments and Observations on the Origin of Species in the Vegetable 
Kingdom. (2 vols.). Numerous illustrations, colored plates. Translated 
by Prof. A. B. Farmer and A. D. Darbishire. Cloth, per volume $4.00. 
Intracellular Pangenesis 
Including a paper on Fertilization and Hybridization. Translated from 
the German by C. Stuart Gager. Cloth, $3.00. 
Special offer. The above five volumes sent prepaid for $io.oo. 
OPEN COURT PUBLISHING CO. Chicago, 111. 
Always mention the JOURNAL OF BOTANY when answering our advertisements. 
