THE DEFINITIONS OF SCIENCE RE-DEFINED. 251 



elements. Fig. 5, Page 28. The atomic weight of the 

 ether he concludes to be nearly one-millionth of that of 

 hydrogen and its atoms consequently travel with enormous 

 velocities. This extreme velocity explains the all-pervading 

 character of the substance. It may be said that, on this 

 hypothesis, Mendlejeff accounts fairly well for the properties 

 of the ether, and his speculations are deserving of more credit 

 and attention than they at present receive. 



