l6 THE POPULAR SCIENCE MONTHLY. 



correspondence which .hows how fully and accurately Spencer 

 himself must have had the whole vast plan marked out in his 

 lnil . D down to the veriest details, before he sat down to 



oomrnit himself to the pinning of a single line. 



, having followed Mr. Spencer to the verge of the great 

 undertaking to the prosecution of which he has devoted the ener- 

 his after-life, we draw our paper to a close; our present 

 purpose ii"t emhracing any direct consideration of that undertak- 

 in itself. The hope which we have ventured to entertain is, 

 thai even such a rapid review as we have thus taken of the earlier 

 period of Mr. Spencer's intellectual activity may prove to be not 

 altogether without its uses to the earnest student of that wonder- 

 ful Bi riea < >f works which, by the common consent of all those most 

 entitled to judge, have won for their author a foremost place 

 long the greatest thinkers of all time. 







SCIENCE AND FINE ART.* 



Bt emil du bois-keymond. 



II. 



[Concluded.] 



ON still another side the development of photography has 

 sured instructive data for art. In the year 1836 the broth- 

 ers William and Edward Weber, in their famous work on the 

 Bit thanism of the Human Organs of Locomotion, represented a 

 man walking in the positions which it was theoretically supposed 

 he must go through during the time of making a step. The strange 

 feature was remarked that while the pictures corresponded at the 

 inning and the end of the step, when the man for a short time 

 had both feet on the ground, with the representations which the 

 ters had always given of a walking man, in the middle of the 

 when the moving leg was swinging by the stationary leg, the 

 mosi eccentric and ludicrous spectacle was presented. The man 

 appeared, like a drunken street musician, to be stumbling over his 

 own feet Never had anybody seen a walking man in such a situa- 

 tion. The brothers Weber proposed on the last page of their work 

 the correctness of their schematic drawings by the aid of 

 topic slides of Stampfer and Plateau, as in the figures 

 's d8Bdaleum,t which has curiously come back to us 

 America as a novelty under the name of the zoetrope or 



iln.itz Commemoration-day in the Academy of Sciences at Berlin, July 



Magazine, etc., January, 1834, Ser. Ill, vol. iv, p. 36. Poggendorff's 

 Annalcn, etc., 1834, vol. xxxii, p. 650. 



