102 THE JOURNAL OF BOTANY 
frost at one ~ - critical periods of the plant’s life—namely, when 
the angie is set 
e low hilt of the Punjab pe from one thousand to 
four enor feet above the sea and ten to twenty miles across, 
at the end of March and in April, when most of the plants are 
coming into flower, one would expect the blossoms to be blighted 
by late frosts; but at that season tha air is filled with the odours 
of essential oils from these blossoms, to such an extent as to be at 
times, especially on a still night, quite overpowering. 
My theory is that these essential oils help to oer radiation 
at night, and thus preserve the blossoms and allow the fruit to set ; 
for it is in that locality only a matter of four or five degrees fall of 
hs eae just at sunrise, which does all the damage 
n the Punjab Himalaya because it was there that this 
matter feat ‘aibracted my atheinbios and probably nowhere else is 
there such risk from late frosts. 
‘Tyndall states that see 2 a he in power of dry air at 1, 
moisture in the air increases o 72; but an infinitesimal trace 
of oil of rosemary gives 74, ok "al of laurel 80, of camomile flowers 
87, of cassia 109, of spikenard, 355, of aniseed 872. I do not know 
if Tyndall’s experiments have been ‘followed up; if not, I think this 
would form an interesting subject for further investigation. 
SHORT NOTES. 
Nomenctature or Brewer1a.—The plant which stands i = Index 
Kewensis as “* Breweria africana voabae & Hook. f. Gen. iii. 877” 
as received two other names under e genus, one of which and 
but publishes a new name for the plant. “The earliest name for 
the plant — Breweria is B, alternifolia Radlk.; the. synonymy 
is as follows 
Baswies 7 ALTERNIFOLIA Radlk, in Abhandl. nat. Ver. Bremen, 
viii. 413 (1888). 
Codonanthus africanus G. Don, Gen. Syst. iv. 166 (1837). 
C. ? alternifolia Planch. in Hook. Ic. P Plant. t. 796 (1848). 
Wilberforcia Hook. f. mss. ex Planch. 1. ¢. 
ea africana Benth. in aes ays 469 Be 
Breweria atioann oma mae re 5 D. Jackson, 
Index Kewensi 37 (Se 93). 
B, Codonanthus Baker ex Oliv. Te. Pl. sub t.2276 te 1908). 
Ames Barr 
. 
