As regards quantity, the following details speak for themselves-I take the theatrical statistics for the year 1895-1896:- The Berlin Opera House produces 60 various works-52 operas and 8 ballets.
"The Operatic Problem"
William Johnson Galloway
According to Lassalle, in the absence as yet of an adequate system of commercial statistics, the number of known conditions is always much smaller than the number of unknown, and the consequence is, that trade is very much a game of chance.
"Contemporary Socialism"
John Rae
Economic politics is, of course, like all other politics, an affair of times and nations; but economic science belongs to mankind, and contains principles which may be accurately enough termed, as Roscher terms them, natural laws, and which may be applied, as he would apply them, to the improvement of particular economic situations, on condition that sufficiently complete and correct statistics are obtained beforehand of the whole actual circumstances.
"Contemporary Socialism"
John Rae