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Thames Advertiser, Volume VIII, Issue 2021, 16 April 1875, Page 3

In a publication entitled " The Chemist and Druggist," a Mr Emerson, a chemist of West Hartlepool, has an interesting paper on fliei, their uses, and we might also add, their abuses. Mr Emerson has instituted a series of microscopical examinations, and bis investigations hare convinced him that flies are most useful and indefatigable aerial scavengers, without whose unwearying services the health of mankind would suffer to a material extent. The microscope revealed to the astonished eye of the experime&tili9t the singular fact that the legs of the flies, in performing their aerial revolutions, collected countless myriads of animalcules, in the scraping together of which for food the flies go through those peculiar movements of rubbing their legs one against the other, and afterwards applying their truuks, wherewith to carry the choice morsels , for digestion. Wherever the air is most impure, these animalcules exist in the greatest numbers, and there the flies congregate also, and busily improve each shining hour. The 'burning of sulphur was discovered to be the means of reducing the number of these animalcules, and consequently of the flies, whose annoying persecutions will be more patiently borne with, when it is known how incalculably useful they are in their peculiar sphere _ Mr Emerson purposes shortly proceeding with a similar serie3 of experiments concerning the utility of the spider, The only men who have s right to talk their extraction — l.'entMs,