What idea and POV is Riis expressing when he says "the children's aid Society and kindred plantraphits organization where yet unborn, but in the city directory was to be found the address of the American society or the promotion of education in Africa "?

It was supposed to already exists.

Explanation:

Once the address of the American society / promotion of education in Africa was published in the city directory it should already be attending the population. But when Riis expressed that  "the children's aid Society and kindred plantraphits organization where yet unborn" we may wonder that it is standing by or with the start date delayed.

voracity is the noun corresponding to the adjective voracious, which means (1) eager to consume a great amount of food, or (2) marked by an insatiable appetite. veracity is far more common than the rare voracity, so the latter is sometimes used in place of the former.

about 25% of a paper can be direct quotes.