1G6 LIGHT SCIENCE FOR LEISUltE HOURS. 



evaporation going" on in the equatorial regions leads to 

 an indraught of cold water in bottom-currents from 

 the polar seas. Such currents coming toward the 

 equator, that is, travelling from latitudes where the 

 earth's eastwardly motion is less to latitudes in which 

 that motion is greater, would lag behind, that is, would 

 have a westwardly motion. It seems now placed 

 beyond a doubt that this is the true explanation of the 

 equatorial ocean-currents. 



Such are a few, and but a few, among the many 

 interesting results which have followed from the recent 

 researches of Dr. Carpenter and Professor Thomson 

 into the hitherto little known depths of the great sea. 



(From the Spectator, December 4, 1869.) 



THE TUNNEL THROUGH MONT CENTS. 



MEX flash their messages across mighty continents 

 and 'beneath the bosom of the wide Atlantic; they 

 weigh the distant planets, and analyze the sun and the 

 stars ; they span Niagara with a railway bridge, and 

 pierce the Alps with a railway tunnel : yet the poet of 

 the age in which all these things are done or doing 

 sings, u ~We men are a puny race." And certainly, 

 the great works which belong to man as a race can no 

 more be held to evidence the importance of the indi- 

 vidual man than the vast coral reefs and atolls of the 



