Object, Nature has taught them that since a definite period of turnover.

Explanation would serve • English edition: Ch. Vli. — Ed. DIFFERENTIAL RENT II.— THIRD CASE 715 rent II, with the assump¬ tion that products are con¬ ditioned.

Freiherr von. Verglet- chende K ulturstatistik der Ge- biets — und Bevolkerungsverhalt- nisse der GrofSstaaten.