148 



^CiKNCK. 



[Vol. XV. No. 369 



to, but rather what I believed to be a misconceptioii of the 

 nature of certaiu phenomena which such misuse seemed to 

 imply. Let me see if I can maintain my ground. 



If two bodies connected by an elastic medium retain their 

 relative positions, the two may be transported cr caused to 

 move in any or all possible ways, and still with all speeds ; 

 yet the condition of stress under which this elastic connecting 

 medium exists is not changed at all. If a force be exerted upon 

 one of these bodies, tending to change its position relative to 

 the other, the stress of ihe elastic connecting medium will be 

 changed ; and I do not think it necessary to conceive of a rate 

 of propagation of this modified stress from the one object to the 



other, for, if the second body were not attached to the first in 

 some way, the force applied to the first could produce no stress 

 whatever in the medium connecting the two. A push on one 

 becomes a pull on the other, but there could be no push on the 

 one without there being an exactly equal and opposite effect 

 upon the other. Has any propagation taken place in this case? 

 If, again, we have a system of bodies, all of which are con- 

 nected with each other by elastic strings or by a pervading 

 elastic medium, any movement of one of these bodies necessarily 

 involves a change of stress between all of them. A push on 

 one means a pull of exactly equal amount on others. There 

 can be no push without a resistance, and this resistance is a 



received at Editor's Offic 

 Feb. 17-22. 



Kansas Academy of Science, Transactions of the 

 Twentieth and Twenty- first Annual Meetings of 

 the, 1887-88. Vol. XI. Topeka, State. 127 p. 

 8°. 



U. S. Coast and Geodetic Survey. Chart showing 

 Annual Change of the Magnetic Declination for 

 the Epoch January, 1890. Washington, Q-overn- 

 ment. Scale 1 : 10,000,000. 



Chart showing Magnetic Meridians of the 



United States for January, 1890, Washington, 

 Government. Scale 1 : 10.000,000. 



Isogenic Chart for the Epoch 1890. Alaska and 



Adjacent Regions. Washington, Government. 

 Scale 1 : 13,700,000. 



Isogenic Chart of the United States for the 



Epoch 1890. Washington, Government. Scale 

 1 : 7,000,000. 



Ward, H. M. Diseases of Plants. London, Society 

 for promoting Christian Knowledge; New York, 

 E. & J. B. Young & Co. 196 p. 16°. $1. 



Wauters, a J. Stanley's Emin Pasha Expedition. 

 Philadelphia, Lippinoott. 378 p. 12". $8. 



Wedderburn, a. J. A Popular Treatise on the Ex- 

 tent and Character of Food Adulterations. 



(U. S. Dept. Agric, Bulletin No. 25.) Washing- 

 ton, Government. 61 p. S". 

 Whist, American, Illustrated. By G. W. P. Boston 

 and New York, Houghton, MiflBin, & Co. 367 p. 

 160. $1.75. 



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