LIFE HISTORIES OF LEAFHOPPERS OF MAINE. 55 



In the new timothy field, planted in 1912, I counted forty 

 good stems with large heads inside a square foot which would 

 equal 1,000 to twenty-five square feet while in the old field 

 in an equal space there were but 67 good plants. 



In the library field the space five feet square gave : 



Large healthy stems with full heads 67 



Small full formed heads apparently healthy 172 



Injured heads small or blasted 673 



Undeveloped plants, no heads 1052 



The condition of this patch is shown in the photograph the 

 scattering tall plants with fully developed heads showing above 

 the general level while the blighted or undeveloped plants are 

 seen to form a much lower level. Fig. 9a. 



The contrast in these plants may also be seen in the height of 

 plants measured and photographed. Fig. 10. 



Height of 20 uninjured plants, 3 to 4 feet 

 Height of injured or blighted plants, 1 to 2 feet 

 Length of healthy fully developed heads 3 1-2 to 



51-2 inches 

 Length of blighted or injured heads 1 to 3 inches 



In weight there is also quite a striking contrast as shown in 

 figures from these same samples. 



Weight of 20 uninjured plants freshly cut, 100 



grms; dry, 62 grms. 

 Weight of 20 injured plants freshly cut, 30.5- 



grms; dry, 20 grms. 



The weight for the freshly cut samples was taken July 13th 

 and the weights for the dry samples on July 20th. 



It may be argued that a larger number of stems or leaves for 

 the defective plants would meet or offset some of this discrep- 

 ancy in individuals and this is in part true but there must be 1 

 great difference in total weight as well. 



In order to compare the nutritive value of the injured and 

 uninjured plants a chemical analysis of the samples seemed 

 desirable and this was very kindly undertaken by the Statim 

 chemist, Prof. Bartlett. His report is as follows:' 



