30 SCIENTIFIC CATALOGUE. 



Stewart (B.) LESSONS IN ELEMENTARY PHYSICS. 

 By BALFOUR STEWART, F.R.S., Professor of Natural Philosophy 

 in Owens College, Manchester. With numerous Illustrations and 

 Chromolithos of the Spectra of the Sun, Stars, and Nebulas. Second 

 Edition. i8mo. ^s. 6d. 



A description, in an elementary manner, of the most important of 

 those laws which regulate the phenomena of nature. The active 

 agents, heat ^ light, electricity, etc., are regarded as varieties of 

 energy, and the work is so arranged that their relation to one 

 another, looked at in this light, and the paramount importance of 

 the laws of energy, are clearly brought out. The volume contains 

 all the necessary illustrations. The Educational Times calls this 

 11 the beau-ideal of a scientific text-book, clear, accurate, and 

 thorough." 



Thudichum and Dupre. A TREATISE ON THE 

 ORIGIN, NATURE, AND VARIETIES OF WINE. 

 Being a Complete Manual of Viticulture and CEnology. By. J. L. 

 W. THUDICHUM, M.D., and AUGUST DUPR, Ph.D., Lecturer 

 on Chemistry at Westminster Hospital. Medium 8vo. cloth 

 gilt. 25-r. 



In this elaborate work the subject of the manufacture of wine is 

 treated scientifically in minute detail, from every point of view. A 

 chapter is devoted to the Origin and Physiology of Vines, two to the 

 Principles of Viticulture; ^vhile other chapters treat of Vintage and 

 Vinification, the Chemistry of Alcohol, the Acids, Ether, Sugars, 

 and other matters occurring in wine. This introductory matter 

 occupies the first nine chapters, the remaining seventeen chapters 

 being occupied with a detailed account of the Viticulture and the 

 Wines of the various countries of Europe, of the Atlantic Islands, 

 of Asia, of Africa, of America, and of Australia. Besides a 

 number of Analytical and Statistical Tables, the work is enriched 

 with eighty -jive illustrative woodcuts. ' ''A treatise almost ^mique 

 for its usefulness either to the wine-groover, the vendor, or the con- 

 sumer of wine. The analyses of wine are the most complete we 

 have yet seen, exhibiting at a glance the constituent principles of 

 nearly all the wines known in this country."- -Wine Trade Review. 



Wallace (A. R.) CONTRIBUTIONS TO THE THEORY 



OF NATURAL SELECTION. A Series of Essays. By 



