November 3, I893.] 251 A point well devreloped in these e3ssays is the evil of concentration of population, and, together with this, the ever-growingproblem of proper water supply and of sewage disposal. The question of pure air is discussed, and also the purifying powerof "theli-vingearth." Citiesnow comYmitted to the evils of expensive and wasteful water supply, with all the accompanying difficulties and snares of sewage and sewage disposal, Dr. Poore very properly leaves without bis

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... n; they have gone so far as to make a turning back well nigh impossible. WAhere the end will be he does not even con jecture. It is to the rural and suburban population that he appeals, and mcost ably, for a consideration of certain rneans by 'Which, upon a thorough scientific basis, they can secure an efficeient sanitation for their homes, a pure water supply and an increased land value, all at a minimuin of cost. Nor is this rested