Bibliography. 



269 



causes of atmospheric eleetricity. On repeating the experiments a year 

 since, he was struck with the anomalies presented in operating on the 

 bank of a stream, in the water, and also at a certain distance from the 

 plant, and was thus led to study the effects under these circumstances. 

 These effects are complex and change their direction and intensity with 

 the chemical composition of the water and the soil. In each case the re- 

 sults depend on heterogeneity between the water and the soil ; alkaline 

 waters are negative, and acid waters positive ; it follows therefore, that 

 sometimes the effects are null, as happens on the waters of a river and 

 along the sandy banks washed by the floods. 



Bibliography. — Annales de V Observatoire de Paris publiees, par U. J. 

 LeVerrier. Vol. I, in large 4 to, of 420 pages, with a plate. Paris; 

 Mallet-Bachelier. Price 28 francs.— -We have remarked on this work un- 

 der the head of Astronomy. 



(Euvres de Fr. Arago. — Notices Scientifiques. Vol. II. Paris ; Gide 

 et Baudry. — This volume contains, 1st, A historical notice of the Steam 

 Engine ; 2d, a Report on Railroads, historical in character, made to the 

 Chamber of Deputies, June 12, 1836 ; 3d, A Report on the introduction 

 of the Electric Telegraph into France, a report combatted at the time by 

 " les obscurantistes" on the ground that the electric telegraph was a chi- 

 mera ; 4th, a Report on limestone, mortars, hydraulic cements, native and 

 artificial puzzolanas; 5th, A series of remarkable articles under the title 

 of Navigation, treating of different maritime questions. An announce- 

 ment of the subjects in this volume is sufficient to exhibit its importance. 



Le Materiel Agricole, ou Description et Examen des Instruments et des 

 Machines usites en Agriculture, par A. Jourdier. — Paris : Hachette. 1 

 volume in 12 mo, containing in a concise and elegant form accounts of the 

 principal agricultural operations followed in France. 



Notions d' 1 Hygiene pratique, par le Dr. Isidore Bourdon. — 1 volume 

 in 16 mo. of 380 pages, treating fully of the general subject of Hygiene. 



Theorie de Logarithmes par Tarnier, Doctor es Sciences mathemat- 

 iques. — A pamphlet of 92 pages in 8vo. Paris : Hachette. 



Elements de Geographie, par Cortambert. 1 volume in 8vo. Paris : 

 Hachette. — The author is a Professor of Geography of high reputation 

 with the Parisian public, and his works are in good demand. 



Precis d'Histoire Naturelle, par M. Delafosse. 7th edition in 1 vol- 

 ume of 688 pages 12 mo. — This book is in the hands of all the students 

 and is a convenient introduction to the natural sciences. Its author, M. 

 Delafosse, is moreover Professor of Mineralogy in the Faculty of Sciences 

 of Paris, where he has given instruction for nearly twenty years. 



Les applications nouvelles de la Science a V Industrie et aux Arts, en 

 1855, par L. Figuier, M.D., Doctor es Science, Redacteur du Bulletin 

 Scientifique de la presse. 1 volume of 788 pages in 12 mo. — This small 

 volume is one of the results of the " Universal Exposition" at Paris. It 

 has been well prepared, and has in view an exhibition of the principal 

 applications of science relating to the Steam engine, Steam vessels, Elec- 

 tromotors, Clocks, Electricity and Railroads, Photography, Photographic 

 engraving, Galvanoplasty, Stearic candles, Electric illumination, Heating 

 by gas, Aluminium, etc. etc. 



