“1. How many houses of prostitution are there in your city?
“2. How many houses of assignation are there in your city?
“3. How many public prostitutes are there in your city?
“4. How many private prostitutes are there in your city?
“5. How many kept mistresses are there in your city?
“6. What is the present population of your city?
“Of course these questions can be answered to you, by your chief of police and officers, only as to the best of their knowledge; but, as a general thing, shrewd police-officers will be able to give correct answers to them. I do not wish names, only the round numbers in each class.
“I shall do myself the honor to forward you a copy of the report when completed, and shall be glad to receive your replies to the above queries by the 30th of this month. You will please direct your answer to
“Yours respectfully,
“William W. Sanger,
“Resident Physician, Blackwell’s Island, New York City.”
The following are the replies received: