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encies for slaughter31. New metals, chemicals, and elements h

d from the standpoint of inventive progress, the first half of th

eteenth century had passed very profita

e credited to statesman, warrior26, or creative writer of the same

actly four decades of steam navigation on American waters. Railways were growing a

he rate of nearly one thousand miles annually27. Gas had become familiar

ans of illumination in large cities. Looms28 and tools and printing-presses were everyw

re being liberated29 from the slow toil of man-power. The

st photographs had been taken. Chloroform, nitrous oxide30 gas, and ether had been place

service of the physician in saving life, and the revolver, guncotton, and nitroglycerine adde