A Partial List of Books in the 

 OPEN COURT SCIENCE SERIES 



PROBLEMS OF SCIENCE 



BY FEDERIGO ENRIQUES 



Authorized translation by Katherine Royce, with an 

 introduction by Josiah Royce. Pp. 375. Price, $2.50. 



"The end for which we ought to strive today is a scien- 

 tific education, which shall enable the workers in any field 

 whatsoever to understand better how the object of their 

 own research is subordinated to more general problems." 



The author is professor of projective geometry and geo- 

 metric drawing in the University of Bologna, and is one of 

 the most conspicuous of contemporary Italian scientists. 



The Primary Factors of Organic Evolution 



By E. D. Cope 

 Illustrated. Cloth, $2.00 net 



The Soul of Man By Paul Cams 



An investigation of the facts of physiological 

 and experimental psychology. Illustrated. Cloth, 

 $1.50 net; paper, 85c. 



Plant Breeding By Hugo De Vries 



Comments on the experiments of Nilsson and 

 Burbank. Illustrated. Cloth, gilt, $1.50 net 



The Rise of Man By Paul Carus 



A sketch of the human race. Illustrated. 

 Boards, cloth back, 75c net 



Species and Varieties, Their Origin and Mutation 



By Hugo De Vries 

 Edited by D. T. MacDougal. Price, $5.00 net 



The Mutation Theory By Hugo De Vries 



Experiments and observations on the origin of 

 species in the vegetable kingdom. (2 vols.) Trans- 

 lated by Prof. A. B. Farmer and A. D. Darbishire. 

 Numerous illustrations, colored plates. Cloth, per 

 volume $4.00 net. 



