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hear much of Race Suicide today. Perhaps under a more simple and san- 
itary life the race would again become strong and healthy and prolific, just 
as soil left to nature returns to its former condition. 
I referred to the fact that many of our plants are constantly on the 
move. We see this exemplified again in man. Some people are moving all 
the time, one miglt almost come to the conclusion that the old-time homie 
is disappearing. People will move from one house into another, from one 
street to another, froin one towh to another, alternating perhaps between 
town and country and from one end of the country to the other. One 
Wonders why people move so much. One important cause in my observation 
is oh account of ill health. Many move into another house or into another 
town in the hope of having better health. When they do find a congenial 
place they are apt to stay, just as plants and animals stay. 
It is interesting to study the movement of population, of towns as a 
whoie or of certain streets or of certain buildings in the heart of the city, 
say a large store or office or bank. “Office boys” are both from city and 
country ; many country boys go to the city to “try city lifey. Some succeed 
but many fail. We hear of the successes but we usually do not hear of the 
failures, although there may be only one successful man to a hundred or 
several hundred failures. I am reminded of the remark of an old mer- 
chant: “The new boy who cannot stand the work of sweeping out the 
store and running errands is not apt to make a good business man”, mean- 
ing in this case a storekeeper. The merchant knew this as a fact, he did 
not attempt to explain it. I offered him this explanation : 
The new boy when put to sweeping may or may not react to dust 
influences. If he reacts there will be more or less complaint of ill health 
and in time he will drop out; if he does not react he may gradually advance 
and in time become a business man. The merchant whose name appears in 
the city directory year after year may be regarded as an immune, as an 
individual able to live under unsanitary city conditions. The directory does 
not mention the numerous failures. The successful business man in the 
city must be regarded as the survival of the fittest. Ie does not move 
ibout; he remains fixed because he is able to bear the unsanitary environ- 
ment. This moving about is, of course, seen at its best in large manu- 
facturing establishments, where there is a constant influx of “new hands”. 
Looking over the books on diseases of plants, one is surprised at the 
malogy between plant diseases and human diseases. One finds plant 
