SPECIAL OFFER 



OF 



The Works of Hu£o 

 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 of the Vege- 

 table Kingdom. (2 vols.) Numerous illustrations, 

 colored plates. Translated by Prof. A. B. Farmer 

 and A. D. Darbishire. Cloth, per volume, $4.00 8.00 



INTRACELLULAR PANGENESIS. Including a 

 paper on Fertilization and Hybridization. Trans- 

 lated from the German by C. Stuart Gager. Clot h 3.00 



Total - $17.50 



The five volumes sent prepaid for $10.00 



This special reduction is made to students of 

 the Works of this great Dutch Botanist DeVries. 

 The offer is limited to a small remainder of the 

 present edition. 



•Send for Complete Catalogue of 



The Open Court Publishing Co, 



Chicago and London 



