THE GARDENERS’ CHRONICLE. 
[FEBRUARY 22, 1919, 
EDITORIAL NOTICE, 
Special Noti to Correspondents. — The 
Editors do tg undertake to pay for et contri- 
butions or illustrations, or to return unused com- 
munications or illustrations unless by special 
i Baie Peay d do not hold кос 
ons ezpressed by thei 
ae TSE will greatly oblige 
by ad to the Editors early intelligence of 
ocal ponte likely to be of grant bo ed age eis 6: 
of a Дын а which it is e e to bri 
e ce 2 ae ulturist. 
Editors and Pub — Gut. rrespondents 
ne сокса answers to 
and save us much time an 
g and "d моги. 
"d delay 
тесей. 
tw 
1, ате distinct, 
confusio on arise 
y cannot be sible 
Letters for Publication, as well as specimens of 
plants for naming, should be addressed = de: 
RS, 41, гацав 
po pe n 
ON ONLY ОР: ТН! РЕВ, 
у in the уз a pe ossi sible, and duly ре is 
the riter: y desired, m Signatura vain not " 
inted, but ki ntee of good faith 
APPOINTMENTS FOR THE ENSUING WEEK. 
R 
. meet: Lecture by Capt. 
Arthur Hill, M.Á., at 5 p.m. on “The Care of Our 
Soldiers’ Graves.” 
SALES FOR THE ENSUING WEEK. 
hedge eae gt FEBR 
Sale ruit Trees, Herbaceous Plants, 
inii Flower Seeds; &c., at 67/68, Cheapside, by 
Protheroe & Morris, at 1 o'clock, 
undred cases of Retarded Japanese 
slt E.C.2, by Protheroe & 
- 12,000 Fru ae Trepa, em Pears, Plums, апа 
Cherries, Jua eo A кы Felt- 
ham, by prio a ig en & Sons, by 
Protheroe & Morris, at 12 о "lock : 
AVERAGE MEAN. TEMPERÀTURE for the ensuing week 
асе from уе; dg газы during the last fifty 
years at Greenwich 
ACTUA. 
UAL TEMPER. 
Gardeners’ ‘Chronicle i Office, 41, Wellington Street, 
Covent бачы London, BA seer Eebroary 
0 а Bar. 29,28: 419. 
he botanist who 
takes-an interest in the 
chemical attributes - of 
plants, no less than to 
the. РЕЛЕ chemist, the publication 
of a full and дно e account of the 
natural colouring matters of plants* is 
noteworthy an welcome ‘eve 
h 
Plant Dyes, 
n for 
work is in a sense an ituary notice 
dustrially defunet—having, as is the way 
f the world, been s superseded is artifi- 
ant quem ced substitu 
Such is the fate which. iis befallen the 
qu it tural pigments, Tyrian pur- 
ple—the dye derived from arine mol 
luse, and such that of Madder, at one 
time the most universally used of all pig 
ments. Natural indigo still ee in 
the land living colou 
fighting for its life with ey ditti. 
produced indi 
It is small 
wonder that the ancient 
world made use of plant dye stuff, for 
once the oe ^u kis g became 
kno it soon discovered that 
aliae. oy kind of plant is capable, in 
the presence of a mordánt such as a 
skins, fungi of 
Scotland and I —as eis 8 
lants ‘of Ора! origin Hs. en 
used, for, besides making colours for the 
adornment: of her -flowers and ` fruits, 
ature has. plied to almost all her 
children of the plant Id colourless or 
yellow chemicals known as flavones which, 
hen used with mordants give yellow ‘or 
green dy These colourless or faintly 
coloured moth f dyes occur. in th 
plant.in bination with sugar, in the 
form of ides. ` When the plant 
tissues ave destroyed the combination. of 
sugar and potential dye is broken up, 
ften by the agency, of enzymes contained 
in the plant i 
chemic ihe x mor ч Thus it 
may be claimed for Nature that her poten- 
tiality. for y gr e an 
r actual display, lovely though that be 
ost ancient an rtant of n a 
es. It is extracted from the root of Rubia 
tinctoria, whic many countries is 
in 
zari—hence the =“ alizarin 
ts artificial supplante 
ist the most Ac EA of 
ar 
anthocyans, which give the blue, purple, 
nd re tion to flow Thanks 
to the researches of Willstütter, Everest, 
and other: e mieal constitution of 
pi ` been settled be- 
dou closely related 
chemically tot 
n-glucos 
cyanidin, may also be present. 
When oxidised the cyanidin gives rise 
toa цот, ‘substance which is, or closely 
. ture, for w 
— ———————— 
resembles, a ''flavone." Similarly, by 
S are to be ob- 
Thus the 
it ecy may be read righ 
through must be able to tell us how 
it is that the colours of plants are in 
eneral so and how different 
pass hey are rare. 
UID neos constancy out of such in- 
constant things is the puzzle here as else- 
whe 
ere. 
In any case, the scientific botanists and 
the hybridists are deeply in the debt of 
he authors this work, hi will. profit 
greatly by. the ee of the authors not 
Y 
e pos sible the x writing of m 
of its most valuable pag 
‘Coloured Plate in our Next Issue. — The 
issue for March 1 will contain a supp'ementary, 
ull-page, coloured illustration of Odontadenia 
хтар etl s should see ow this illus- 
nies each copy of the Gardeners' 
Chronicle of iba above date. 
Allotments in the London County Council's 
Parks.—It is announced that holders of allot- 
ments in the jua administered by the London 
ounty Council will have to surrender their 
anuary 1, 1920 
et n € 
horticultura c 
the University of London, on the Sena 
which he h vi carried the confer 
iculture, which. had 
ti 
versity rank. firs’ 
Degree of Bachélos or in “Scien ce bas" 
hich there were alréady five éandi- 
is just about to take ейт 
—A trial of Roses 
dates, is 
cuya by the jury during two sea- 
DAN nal атаган made in October, 
rt Disease in the 
cases were те ported i 
in districts in the North ae 
ibited, but the ed immu 
that are all planted i ee 
inch some heaviest cropping varieti { 
der cultivation. As regards the movement © 
lisease from th ected areas 0: 
gland, under the Wart Di IR а 
Order of 1918 the planting of Potatos grown Ыы 
inf ia prohibi im that. 
in 
