...accurately collect the information desired. To do this he must visit personally each dwelling-house in his sub-division, and each family therein, and...individual living out of a family in any place of abode. In cities he must inquire at great mercantile houses if families are living in the upper part of such...

...personally each dwelling house in his district, and each family therein, and each individual living put of a family in any place of abode, and by inquiry made of the head of each family, or of the member thereof deemed most creditable and worthy of trust, or of each individual...