34 THE POPULAR SCIENCE MONTHLY. 



Fig. 6, the accumulation on the tip of a blade of grass, seven 

 eighths of an inch long. This fragment was broken off and 

 brought into the house to show how all the grass was decorated 

 by the storm of January 6th, with wind at forty miles an hour 

 and temperature twenty degrees below zero. It was two inches 

 and three quarters tall and weighed three quarters of an ounce 

 avoirdupois, or more than five thousand times as much as the bit 

 of grass inclosed by it. It was composed of ten large feathers, 

 with the spaces between them filled with smaller ones no shape- 

 less snow about it. The tips of twigs, ends of fence rails, etc., 

 projecting toward the wind, were all similarly decorated, but on 

 different scales, according to their size and exposure. 



Many curious and apparently contradictory effects are pro- 

 duced by the rebound from one surface to another. A post which 



FIG. 7. 



stood twenty feet from the house, in a small court inclosed on 

 three sides, had a deposit on the face toward the house equal 

 to that on the windward side, while the other sides were bare 

 and dry. 



Fig. 7 shows a wreath of plumes averaging six inches in 

 length, formed altogether upon the leeward side of a tub, by the 

 rebound of the vapor-laden wind from a high wall about three 

 feet distant. It will be seen that the rebound from the tub again 

 has produced a second series of forms around it on the ground, 

 pointing toward the tub. 



The most conspicuous and noteworthy example of this resili- 



