CHARLES DARWIN'S COMPLETE WORKS. 



Origin of Species by Means of Natural Selection, or the Preservation of 

 Favored Races in the Struggle for Life. From sixth and last London edition. 

 2 vols., 12mo. Cloth, §4.00. 



" Personally and practically exercised in zoology, in minute anatomy, in seology, a student of 

 eeograpbical distribution, not in maps and in museums, but by long voyages and laborious collec- 

 tion ; having largely advanced each of these branches of science, and haviuL' spent many years in 

 gathering and sifting materials for his present work, the store of accurately-registered facts upon 

 which tiie author of the "Origin of Species" is able to draw at will, is prodigious."— PTO/e«S07- 

 T. H. Huxley. 



"His first point is to show ihat species are in many cases not well defined, and that the whole 

 order of natural liistory seems to be in a state of mutation, by reason of consiat.t variations. 

 Thus, even under domestication, important changes may be introduced by intercrossing, by selec- 

 tion of the best individuals for propagation, by crossing pa'-ents marked by however slight but 

 favorable peculiarities. 



"His second point is what he terms the universal and necess.arv struggle for existence. This 

 follows from the high geometrical ratio of increase common to all beings. If there were no catas- 

 trophes, any one of the existing species would be sufficiently numerous in a few thousand years 

 to cover the whole earth, to the exclusion of everything else. 



•' His third point is to prove that this strusele is directed by the law of natural selection. Even 

 the races of domestic animals may be constantly improved and modified by classing the best i indi- 

 viduals for propagation. Nature brinas the same discipline to bear upon the whole domain of 

 animal and vegetable life. She seizes at once upon any slight variation that is favomble. and per- 

 petuates it ; in the universal pressure, any variation tha't is injurious is immediately extinguished." 



Descent of Man, and Selection in Relation to Sex. With many Illustra- 

 tions. 12mo. Cloth, S3. 00. 



" In these volumes Mr. Darwin has brought forward all the facts and arguments which science 

 has to offer in favor of the doctrine that man has arisen by gradual development from the lowest 

 point of animal life. He had orisjinally intended this work as a posthumous publication, but the 

 extensive acceptance of the views unfolded in his book on the • Origin of Species ' induced him to 

 believe that the public were ripe for the most advanced deductions from his theory of 'Natural 

 Selection.' Aside from the lo^rical purpose which Mr. Darwin had in view, his work is an original 

 and fascinating contribution to the most interesting portion of natural history."' 



Emotional Expressions of Man and the Lo"wer Animals. 12mo. Cloth, 



S3 50. 



" Whatever one thinks of Mr Darwin's theory, it must he admitted that his great powers of 

 observation are as conspicuous as ever in this inquiry. During a space of more than thirty years, 

 be has. with exemniary patience, been accumulating "information from all available sources. The 

 result of all this is undoubtedly the collection of a mass of minute and trustworthy information 

 which must possess the highest value, whatever may be the conclusions ultimately deduced from 

 it.'— London Times. 



Journal of Researches into the Natural History and Geology of the 



Countries visited during the Voyage of H. M. S. Beagle round the 



World. 12mo. Cloth, -$2.00. 



"Darwin was nearly five years on board the Beasle. A keen observer and a genuine philoso- 

 pher, he has brought hack to us a precious freight of facts and truths. The work has been for 

 some time before the public, and has won a high place among readers of every class. It is not so 

 scientific as to be above the comprehension of intelliirent readers who are not scientific. Some 

 facts and species, new even to ths scientific, are brouL'ht to light. Darwin's transparent, eloquent 

 style riihly illuminates his oiiservations. The weightier matters to which he alludes are inter- 

 spersed among more familiar observations, such as would naturally be made by a traveler passing 

 through new atid wonderful scenes." — Northwestern Christian Advocate. < 



Variation of Animals and Plants under Domestication. With Illustra- 

 tions. Revised edition. 2 vols., 12mo. Cloth, §5.00. 



"The object of this work is not to describe all the many races of animals which have been 

 domesticated by roan, and ol the plants which have been cultivated by him. It is mv intension to 

 give under the head of each species only such facts as I liave been able to collect or observe, show- 

 ing the amount and nature of the chances which animals and plants have undert^'one whili' under 

 man's dominion, or which bear upon the sretieral principles of variation. I shall treat, as fully as 

 my materials permit, the whole subject of variation under domestication. We may thus hope to 

 obtain some lis-bt on the causes of variability— on the laws which sovem it. such as the direct 

 action of climate and food, the effects of use and disuse, and r.f correlation of irrowth— and on the 

 amount of chanare to which domesticated organisms are liable. We shall learn something of the 

 laws of inheritance, of the effects of crossing different breeds, and on that sterility which often 

 supervenes when orsanic beings are removed from their natural conditions of life, and likesvise 

 when they are too closely interbred.' — From the Introduction. 



