Features of the March Popular 

 Science Monthly 



Above the plank floor which now consti- 

 tutes Broadway, in jront of the Metropolitan 

 Opera House, are silks and jewels and glitter- 

 ing lights; below it in half darkness a squad 

 of laborers in khaki overalls, stained with 

 sweated mud, are risking their lives to build 

 another subumy. 



In the March number the unseen under- 

 ground activities of New York are revealed 

 in an absorbing article and in a dozen or more 

 interesting pictures — done in the Popular 

 Science Monthly way — to show exactly 

 how sewer pipes are being rearranged, how 

 rock is being blasted, how a tunnel is being 

 sunk beneath the Harlem River. 



Why did England declare cotton contra- 

 band of war ? You ivill find out if you ivill 

 read in the March number an article which 

 traces cotton from the time that it is in the 

 boll on some southern plantation, to the time 

 when it is placed in the breech of a As^-centi- 

 meter gun in the form of smokeless powder 

 of terrific energy. 



Of course there are other articles equally 

 worth reading. But how can we enumerate 

 three hundred subjects in two hundred words? 



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