THE CENTURY'S PROGRESS IN METEOROLOGY 



h} 7 drographer and meteorologist, advocated a theory of 

 gravitation as the chief cause of the currents, claiming 

 that difference in density, due to difference in temper- 

 ature and saltness, would sufficiently account for the 



LIEUTENANT MATTHEW FONTAINE MAURY 



oceanic circulation. This theory gained great popularity 

 through the wide circulation of Maury's Physical Geog- 

 raphy of the Sea, which is said to have passed through 

 more editions than an other scientific book of the 



