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NATURE STUDY REVIEW [9:8— Nov., 1913 



bred. A fortune might be made raising flies at ten cents a quart. 

 All honors or prizes should be given for the less rather than for the 

 more, for complete flylessness of a home, block, or section of a city. 



In case such work has been done effectively, study carefully the 

 vital statistics of the city and try to estimate fairly how much, 

 disease and mortality has been decreased by riddance from this 

 plague. 



Under plans suggested and now in the field, I have seen homes so 

 free from flies that screen doors and windows were not needed and 

 while I have yet to see an absolutely flyless city, I have spent the 

 past week in a residence section of Cleveland and I did not see one 

 single typhoid fly in or outside of the house the entire week. 



There can be no doubt that these lessons are leavening and 

 vitalizing the whole lump of our home, community and national 

 life. With the progress of the past three years kept upland 

 increased, as all good movements tend to do, we may hope to see a 

 flyless country within the next ten years, and then we may be the 

 cleanliest, healthiest and most completely civic, civilized and decent 

 people on the face of the earth. 



Duckweed (Spirodela polyrhiza) 



The growth from a single plant in twelve days. Photo and culture 

 by L. S. Hawkins. Note the grouping in pairs, with small lobes 

 forming between the larger old ones of the dividing individuals. 



