GENERAL CONSIDERATION OF PLANT DISEASES 



285 



The author found the weight of a branch of Liriodendron tuUpiJera with 

 ice upon it to be 50 grams, without ice 9 grams; so that the ice weighed 

 41 grams, giving a ratio of i : 4.5. Juniperus virginiana with its ice 

 load weighed 310 grams, without ice 13 grams, making the weight of ice 

 297, a ratio of i : 23. Beginning with Dec. 5, 1914, a combination 

 rain, snow and ice storm swept across the Eastern States doing much 







10 



12 



13 



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17 



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Fig. 113. — Sectional view of twigs and leaves of various plants showing load of 

 ice carried during the ice storm of Feb. 12 and 13, 1916. i, Acer plalanoides; 2, 

 blade of grass; 3, Chionanthiis virginicus; 4, Diervilla florida; 5, Forsythia suspensa; 

 6, Liguslrum vulgare; 7, Liriodendron lulipifera; 8, Platanus orientalis; 9, Populus 

 alba; 10, Populus delloides; 11, Quercus paluslris; 12, Syringa vulgaris; 13, Tilia 

 americana; 14, Tecotna radicans; 15, xanthoceras sorbifolia; 16, Spiraea Thunbergii; 

 17, leaf of Rhododendron maximum; 18, icicle on tip of Rhododendron maxifnum, 

 leaf hanging down. 



local damage^ and again on Friday, Dec. 31, a severe ice storm visited 

 the mountain region of Pennsylvania contiguous to the Juniata Valley 

 and Susquehanna River. During the afternoon of Saturday, Feb. 12, 

 191 6, a cold rain began which continued well into the night, coating the 

 pavements, streets, and trees with hard ice. On Sunday morning, 

 Feb. 13, men, boys and girls took advantage of the icy streets to skate 

 1 Illick, J. S.: A Destructive Snow and Tee Storm. Forest Leaves, xv: 103- 

 107, Fehriiari', tqi6. 



