The evidence of this is seen in the increase in number and the prosperity of those pursuits which purvey to luxury, as the automobile industry and the florists' trade and the greatly increased scope and activity of the social game.

On the other hand, there is an increase in the number of people who are to a greater or less extent dependent upon extraneous aid, evinced among other ways by the increase in the asylum populations.

Both these conditions, wealth and poverty, are important disease factors.
Tuberculosis is now a disease of the proletariat chiefly.

The measures both of prevention and cure can be and are carried out by the well-to-do, but the disease must remain where there are the conditions of the slums.

Of all the conditions favoring infant mortality poverty comes first.