Demography (Greek demos, people; graphs, I write - like most scientific terms formed from Greek words, its correctness is questionable), descriptive sociology based on statistics. Thus Mr. Charles Booth's inquiries into pauperism, or investigations of variations in the death-rate or the average of suicide, might be included under the term. It has, however, been specially applied to sanitary science. An "International Congress of Hygiene and Demography" was held in London in 1891. The word is recent, and of foreign origin.