SCIENTIFIC PUBLICATIONS. 



The Brain and its Functions. 



By J. LuYS, Physician to the Hospice de la Salpetriere. With Illustra- 

 tions. 12mo. Cloth, $1.50. 



"No living physiologist is better entitled to speak witli authoiity upon the structure 

 and fanction? of the brain than Dr. Lays. His studies on the anatomy of the nt-rvous 

 system are acljnowledged to be the fullest and most systematic evt-r undertaken. Dr. 

 Luys supports his conclusions not only by his own anatomical researches, but also by 

 many functional ohservations of various other physiologists, including of course Professor 

 Ferrier's now classical experiments."— 6'<. Janies''d Gazelle. 



" Dr. Luys. at the head of the great French Insane Asylum, is one of the most eminent 

 and successful investigators of cerebral science now living; and he has given unquestion- 

 aiily the clearest and most interesting brief acconnt yet made of the structure and opera- 

 tions of the brain. We have been fascinated by this volume more than by any other treatise 

 we have vet seen on the machinery of sensibility and thought; and we have been instructed 

 not only by niucii that is new, bnt by many sagacious practical hints such as it is well loir 

 everybody to understand." — The Popular Science MonUdy. 



Tiie Concepts and Theories of Modern Physics. 



By J. B. Stallo. 12mo. Ooth, %\.1Z. 



"■Judge Stallo's work is an inc^uiry into the validity of those mechanical conceptions 

 of the universe which are now held as fundamental in physical science. He takes up the 

 liading modern diKstrines which are based upon this mechanical conception, such as the 

 atomic constitution of matter, the kinetic theory of gases, the conservation of energy, the 

 nebiiiir hypothesis, and other views, to find how much stands upon solid empirical tnonnd, 

 and how much rests upon metaphysical specnlation. Since the appearance of Dr. Draper's 

 • Religion and Science," no book has been published in the country calculated to make so 

 deep an impression on thouglitful and educated readers as this volume. . . . The range 

 aiul minuteness of the author's leai-nimr, the arnteness of his reasoning, and the sinculai 

 precision and clearness of his style, arj qualities which very seldom have been jointly 

 es-iibited in a scientific treatise."— iV'ew York Sun. 



The Formation of Vegetable Mould, 



THROUGH TIIE ACTION OF WORMS, WITH OBSERVATIONS ON 

 THEIR HABITS. By Charles Darwin, LL. D., F. R. S., author of " On 

 tlie Origin of Spedes," etc., etc. With Illustrations. 12mo, cloth. Price, 



$1.50. 



"■Mr. Darwin's little volume on the habits and instincte of earth-worms is no less 

 marked than the earlier or more elaborate efTorts of his genius by freshness of observation, 

 unfailing power of interpreting and correlatintr fact^, and logical vigor ni generalizmg 

 upon thern. The main purpose of the work is to point out the share winch worms have 

 taken in the formation of the layer of vegetable mould which covers the whole surface of 

 the lind in every moderately humid couiitry. All lovers of nature will unite in thanking 

 Mr. Darwin for the new and interesting Iteht he has thrown upon a subject fo long over- 

 looked, yet so full of interest a;nd instruction, as the structure and the labors of the earth- 

 worm."— *Sa('«7'(:^ay Eemeiff. 



" Respecting wormi? as among the most useful portions of animate nature. Dr. Darwin 

 relates, in this remarkable Iwok. their structure and habits, the part they have played m 

 the burial of ancient buildings aui the denudation of the land, in the disintegration oi 

 rocks, the preparation of soil for the growth ol plants, and in the natural history of the 

 world."- i?o«to« Advertiser. 



New York-. D. APPLETON & CO., 1, 3, & 5 Bond Street, 



