MAN'S SUBMARINE WORK. 383 



which readily suggest themselves to careful readers. 



But, there is a limit to the field of the most 

 expert diver, and with the best of preparation. As 

 he descends in the water,the pressure upon him 

 constantly increases, it is estimated, at the rate of 

 one atmosphere for every thirty-two feet of depth, 

 so when he is down thirty -two feet, he is subjected 

 to a pressure of two atmospheres; at sixty-four feet 

 the pressure is three atmospheres and so on. When 

 he reaches a depth of two hunderd feet the press- 

 ure is so great that he becomes dizzy, the blood 

 gushes from his nostrils and he becomes insensible. 

 It is found that the depth of one hundred and eighty 

 feet is the lowest in which a diver can operate with 

 success. 



The ocean has always been a formidable barrier 

 obstructing man's progress in subduing Earth, but 

 modern thought, industry and science are daily 

 overcoming difficulties seemingly insurmountable. 



Human ingenuity has made a pathway for the 

 lightning through the midst of the deep, and thus, 

 at one gigantic sweep annihilated the world of wa- 

 ters which so long had hindered the intercourse of 

 nations. How simple the matter when once accom- 

 plished. A wire laid upon the bottom of the sea, 

 and a thimble full of acid, and time and distance 

 and oceans are as nothing. 



Such vast results have followed the achievement 

 of laying the Atlantic cable, and the public heart 

 was so thrilled with the success, that cable and 

 ocean have ever since seemed to be parts of each 

 other. One bears precious friends, goods, wares and 



