times in one winter, but the crystals were successively smaller 

 and closer to the ground each time. 



At the time my last paper on this subject was written I was 

 sojourning temporarily in Florida, and did not have access to 

 the literature of the subject, but Dr. A. H. Graves, who was 

 then editing Torreya temporarily, kindly supplied some refer- 

 ences that I remembered only vaguely, and a few others. Three 

 more papers can be cited now, two by Dr. K. M. Wiegand, in 

 the Plant World, Vol. 9, 1906. The first is "The occurrence of 

 ice in plant tissues," on pages 25-39 of the February number, 

 and the second "The passage of water from the plant cell in 

 freezing," on pages 107-118 of the May number. (The last, it 

 happens, immediately follows the paper in which I reported 

 "frost flowers" on Verhesina occidentalis in Tuscaloosa County, 

 Alabama.) Another is by W. W. Coblentz, "The exudation of 

 ice from stems of plants," in the Scientific Monthly 2: 334-349, 

 figs. 1-14. "April" (March), 1916. This deals mostly with Cu- 

 nila, and refers to some previous literature on the subject. 



Supplementary Note. While the foregoing was awaiting 

 publication I learned of two additional cases of "frost-flowers" 

 in Alabama, through Mr. R. L. James, a farmer of near Russell- 

 ville, Franklin County, who has been sending me plants for 

 identification for about three years past. 



On Sept. 14, 1937, he sent me a specimen of Verhesina vir- 

 ginica, with the remark that "large crusts of ice form about the 

 base of the stalk when the first freezes come in the fall." On 

 looking up the plant in Small's Manual of the Southeastern 

 Flora (1933), to make sure of the identification, I noticed that 

 one of the common names given there is "frost-weed." (But no 

 such name for it appears in his Flora of the Southeastern United 

 States, 1903.) So evidently the same phenomenon in that 

 species had been noticed by others, though I am not at present 

 acquainted with any specific mention of the fact in botanical 

 literature. 



Later in the fall Mr. James sent me a specimen of Lespedeza 

 hirta, with the observation that it too sometimes produced ice 

 crystals, ^^'hen I expressed some surprise he assured me on Dec. 

 14 that he had seen the ice on a great many plants of that spe- 

 cies on Nov. 20, 21 and 22, and had subsequently seen many 



