# * # The bound volumes o/The Popular Science Monthly form 

 an invaluable collection of contributions by eminent authorities to every 

 department of scientific knowledge ', and a set of these volumes would 

 be a precious addition to any private library. 



Bound Volume LVI 



Popular Science 

 Monthly 



NOVEMBER, 1899 — APRIL, 1900 



NOW READY FOR DELIVERY. 



Price, including delivery charges, 



Green Cloth, Gold Lettering, . . . $2.50 



Some of the Features of this Volume are; 

 Studies Of Childhood By Professor James Sully 



Pleasures of the Telescope By Garrett p. Serviss 



The University as a Scientific Workshop 



By Prof. Dr. Friedrich Paulsen 

 Symbols By Helen Zimmern 



Bookbinding : Its Processes and Ideals 



By T. J. Cobden Sanderson 

 Unsolved Problems Of Science By the Marquis of Salisbury 



The Need of Educated Men 



By President David Starr Jordan 



The Scientific Work of Tyudall By Lord Rayieigh 



