183) In 1769, _____ invented a better steam engine called the ′Beelzebub.′

184) Who invented a Seed Drill that would distribute the seeds evenly in rows, over a large piece of land?

185) The discovery of a new method of ′Crop Rotation′, was made by

186) In _____, Karl Marx and Friedrich Engels issued the ′Communist Manifesto′ which introduced scientific socialism or Communism.

187) In 1867 Marx and Engels published the first of three volumes, entitled _____, in which they explained the sum and substance of Marxian Socialism or Communism.