Scientifie Publications. 



THE BRAIN AND ITS FUNCTIONS. By J. LnYS, Physician to ths 

 Hospice de la SalpettiSre. With lUustrationa. ISmo. Clotb, $1.50. 



" No living physiologist is better entitled to speak with authority npon tho 

 stractnre and fauctions of the brain than Dr. Lnys. His studies on the anatomy 

 of the nervous system are acknowledged to be the fullest and most systematic 

 ever undertaken. Dr. Luys supports his conclusions not only by his own ana- 

 tomical researches, but also by many functional observations of various other 

 physiologists, including of course Professor IPerrier's now classical experi- 

 ments."— ;Si5. James's Gazette. 



"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 be has 

 given unquestionably the clearest and most interesting brief account yet made of 

 the structure and operations of the brain. We have been fascinated by this vol- 

 ume more than by any other treatise we have yet seen on the machinery of sen- 

 sibility and thought ; and we have been instructed not only by much that is new, 

 but by many sagacious practical hints such as it is well for everybody to under- 

 stand."— jfAe Papular Soience MontlUy. 



THE CONCEPTS AND THEOUIES OF MODERN PHYSICS. Ey 



3. B. Stai,i.o. 12mo. Cloth, $1.TS. 



" Judge Stallo^s work is an inquiry into the validity of those mechanical con- 

 ceptions of the universe which are now held as fundamental in phj^sical science. 

 He takes up the leading modern doctrines which are based upon this mechanical 

 conception, such as the atomic constitution of matter, the kinetic theory of gases, 

 the conservation of energy, the nebular hypothesis, and other views, to find how 

 much stands upon solid empirical ground, and how much rests upon metaphys- 

 ical speculation. Since the appearance of Dr. Draper's ^ Bellgion and Science,' 

 no book has been published in the country calculated to make so deep an impres- 

 sion on thoughtful and educated readers as this volume. . . . The range and 

 minuteness of the author's learning, the acuteness of his reasoning, and the 

 singular precision and clearness of his style, are qualities which very seldom 

 have been jointly exhibited in a scientific treatise. "—Mew York Sun. 



THE FORMATION OF VEGETABIiE MOULD, THROUGH THE 

 ACTION OF WORMS, WITH OBSERVATIONS ON THEIR 

 HABITS. By Ohablks Darwin, LL. D., F.K. S., author of "On the 

 Origin of Species," etc., etc. With Illustrations, 12mo, cloth. Price, $1.60. 



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

 Jess marked than the earlier or more elaborate efforts of his genius by freshness 

 of observation, unfailing power of interpreting and correlating facts, and logical 

 vigor in generalizing upon them. The main purpose of the work is to point out 

 the share which worms have taken in the formation of the layer of vegetable 

 mould which covers the whole surface of the land in every moderately nnmid 

 country. All lovers of nature will unite in thanking Mr. Darwin for the new and 

 interesting light he has thrown upon a subject so fong overlooked, yet so full of 

 interest and instruction, as the structure and the labors of the earth-worm." — 

 Saturday Beview. 



" Respecting worms as among the most nsefhl portions of animate nature. 

 Dr. Darwin relates, in this remarkable hook, their structure and habits, the part 

 they have played in the burial of ancient buildings and the denudation of the 

 land, in the disintegration of rocks, the preparation of soil for the growth of 

 plants, and in the natural history of the yioi\d."— Boston Advertiser. 



D. APPLETON & CO., Publishers, 



1. 3> & 5 Sond Street, Ifew Tork. 



