so SCIENTIFIC BOOKS PUBLISHED BY 



Ward's Steam for the Million. 



Nevj and JZevised Edition. 



8vo. Cloth. $1.00. 



STEAM "FOR THE MILLION. A Popular Treatise on Steam 

 and its Application to the Useful Arts, especially to Naviga- 

 tion. By J. H. Wabd, Commander TJ. S. Navy. New and re- 

 vised edition. 



A most excellent ■work for the young engineer and general reader. Many 

 facts relating to the management of the boiler and engine are set forth -vrith a 

 simplicity of language and perfection of detail that bring the subject home 

 to the reader. — American Engineer. 



"Walker's Screw Propailsion. 



8vo. Cloth. 75 cents. 



NOTES ON SCEEW PROPULSION, its Eise and History. By 

 Oapt. W. H. Waikek, U. S. Navy. 



Commander Walker's book contains an immense amount of concise practi- 

 cal data, and every item of information recorded fully proves that the various 

 points bearing upon it have been well considered previously to expressing an 

 opinion. — London Mining Journal. 



Page's Earth's Crust. 



ISmo. Cloth. 75 cents. 



THE EAETH'S CEUST : a Handy Outline of Geology. By 

 I David Page. 



" Such a work as this 'was much wanted — a -work giving in clear and intel- 

 ligible outline the leading facts of the science, without amplification or irk- 

 some details. It is admirable in arrangement, and clear and easy, and, at the 

 same time, forcible in style. It will lead, we hope, to tho introduction of 

 Geology into many schools that have neither time nor room for the study of 

 large treatises." — The Jiluseum, 



