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stiff but none showed any frost crystals but the stems of the 
colony of Dittany, strung for a hundred feet along the road. 
These crystals were quite different in appearance from those 
which I recall seeing on the base of Frostweed stems, in New 
England, years ago; those of Helianthemum were narrower, 
curled and twisted; these growths on the Dittany were uni- 
formly flat vertical plates, although varying in width and height 
and in fluting and waving of their outer edges. They did not 
appear to have started freezing from any small, central point, 
such as a break or node in the stem, but along a vertical distance 
of half an inch or more. Can anyone offer an explanation as to 
the mechanics of this phenomenon? 
Hous, NEw YORK 
