113 
in Florida before, though it may not be infrequent when the 
right combination of weather conditions occurs. 
That this phenomenon is comparatively rare is suggested by 
the fact that it has been considered worth writing up by several — 
different people in the past, some of whom seem to have just en- 
countered it for the first time. None of the papers on the sub- 
ject is accessible to me at this writing, but I believe some are 
earlier than the reference cited by Mr. Torrey. Some of the best 
accounts are by MacDougal." 
My last previous experience with ‘“‘frost flowers,” as nearly 
as I can remember, was nearly 25 years before, in Tuscaloosa 
County, Alabama. There I found the same sort of crystals, 
though somewhat differently shaped, exuding from the stems of 
Verbesina occidentalis, on December 5, 1905, a day when there 
was frost in shady places all day.’ 
TALLAHASSEE, FLORIDA 
1 MacDougal, D. T., Science 22: 351-352. 1893. Bot. Gaz. 19: 120-121. 
1894. Bot. Gaz. 27: 69-71. 1899. References supplied by Editor. 
? Harper, R. M. Plant World 9: 1906. 
EES iat amine ie oer aT 
Additional notes 
For the benefit of our readers and to give evidence of the 
ancient lineage of this question we quote in part herewith the 
short article in the Botanical Gazette (19: 120-121) by Dr. Mac- 
Dougal referred to by Dr. Harper. It appears from this that the 
observations of this phenomenon go back over 100 years. 
a Frost Plants.—Prof. Lester F. Ward’s observations on (7e 
frost. freaks of the dittany,’ in the GAZETTE for April, , 
c 
bifrons (now Pluchea 
of . 
Stephen Elliot on the stem of Conyza formation on the 
bifrons). Sir John Herschel noticed a similar 
(Quarterly Bulletin of the University of Minnesota 2: 30. 1894. 
: Flora Cestrica p. 350. 1837. ; 322. 1824. 
Sketch of the botany of South Carolina and Georgia. P- 442 
