03 SGientific Intelligence. 



before with the fullness and care devoted to them in tlie pi-esent 

 work. Tl)e author has had the opportunity to study the numer- 

 ous caves in Belgium which afford stalactites and stalagmites 

 of very great variety. Many of these are distinctly crystallized 

 and show different rhombohedrons and scalenohedrons which can 

 be definitely determined. In addition to the distinctly crystallized 

 forms are many others of much interest and variety. 



13. M'm'eralogie de la Prance et de ses Colo^i/'es; by A. Lackoix. 

 Tome Troisi^nip, 2" Partie. Pp. 401-815. Paris (Libraine Poly- 

 technique, Ch. Boranger, Editeur), 1909. — The earlier parts of 

 this admirable Mineralogy of France and the French Colonies 

 have been repeatedly noticed in this Journal. The present part 

 completes Volume III and thus the entire work. It is devoted for 

 the most part to the carbonates, and the species calcite, aragonite, 

 and cerussite are discussed with admirable fullness, the text being 

 accompanied by numerous illustrations. The author is to be 

 congratulated on having brought to completion a work of such 

 magnitude and importance. 



III. Natueal History. 



1. Fungous Diseases of Plants with Chapters on Physiology, 

 Culture Methods and Tedwiique ; by Benjamin Minge Duggak, 

 Pp. xii, 508, 240 figures. Boston and New York (Ginn and 

 Company), 1909. — The writer was recently informed by an 

 experienced mycologist of Europe that the United States led the 

 world in the study of plant diseases, especially as regards their 

 treatment. It is certainly true that since the establishment of 

 the experiment stations in this country the study of fungous 

 diseases has occupied a very prominent part in the work of the 

 various station botanists. Until recently, however, we have had 

 no text-book from an American author upon this very important 

 branch of botany, though the subject is now taught either specifi- 

 cally or in a general way in most of our colleges. 



Professor Duggar of Cornell University has the honor of giv- 

 ing us this first text-book, the title of which is quoted above. 

 While the book is apparently designed primarily as a text- or 

 reference-book for college use, it is of value to anyone wishing 

 a general up-to-date knowledge of the subject. It is divided into 

 three parts, of which the first and second treat of culture methods, 

 technique and physiological relations of the fungi. The greater 

 part of the volume, however, is occupied by the third part, with 

 descriptions of the most important fungous diseases of our eco- 

 nomic plants. These fungi are taken up according to their, sys- 

 tematic relationships, and under each is given its more important 

 literature, its general life history, and the methods employed in 

 controlling it. 



The book is well illustrated with halftones and drawings. The 

 text is carefully written and the mechanical execution is above 



