{London, second half of May 1851] 

... Communists must demonstrate that technological truths al- 
ready attained can only become practicable under communist 
relations... 

Works, First Russian Edition, Vol. XXV, to Marx of 1 June 185] 

Moscow, 1934 : 

time 

a4 Here Marx paraphrases a proverb current in Westphalia (see this volume, 
p. 249). - 5 Good-bye and farewell. 

182