190 
Naturalist's Calendar. 
AT MESSRS. RONALDS & SON’S, BRENTFORD. 
GREEN HOUSE. 
Lithospermum scan- Lipum maritiraum. Salpiglossisatropurpu- 
deiis. Asclepias tuberosa. reus, in variety. 
Trachelium cceruleum. Gladiolus psitticina. ' 
HARDY. 
Georgiana. 
William IV. 
Oueen Adelaide. 
Prince George. 
Surpass Triumph-royal 
Philip the First. 
Foster’s Seedling. 
Fimbriata Surpass. 
Globe Orange. 
Herschel. 
Dwarf Rubella. 
Galinsogea triloba. 
Silene picta. 
Lupiuus Barclayana. 
Hibiscus Africanus. 
DAHLIAS. 
Lady Liverpool. 
Summit of Perfection. 
Eminent, 
Electra. 
Black Prince. 
Indiana. 
Stephania. 
Splendida. 
Zelinda. 
Foster’s Constantia, 
Well’s Bellona. 
Densa. 
Queen of August. 
Albania. 
Crimson Turban. 
Barratt’s Susanna. 
Bona Dea. 
Poppy Anemones, fine, 
sown in March. 
King of the Whihs. 
Cora. 
Julia. 
Lady Osborn. 
Queen of Roses. 
Mountain of Snow. 
Globe Pink. 
Nymphifolia. 
Alba Multiflora. 
Lady Fitz-Harris. 
Scarlet Donna Maria. 
AT MESSRS. C. LODDIGES & SONS’, HACKNEY. 
Maranta cuspidata. 
-- comosa. 
HOT HOUSE. 
Testudinaria Lagunien Zygopetelon maxillaris Epidendrum elongata. 
Justicia venuti. Mackai. -——— cochleatum. 
Sinningia villosa. —^-crinitum. •■■■'■ -polybulbosa Dendrohium Squallis. 
- Helleri. Bletia vericunda. Cypripedium venustum Pleurothallis racemi- 
Jasminumpaniculatum Stylis micrantha. ■ ■ ■ ■■ insigiie. flora. 
Vanda rostrata. 
Andromeda sinensis. 
Hibiscus pedunculatus 
Kalmia hirsuta. 
Wilsonia corymbosa. 
Vernonia flexuosa. 
Gnidium simplex. 
Liparis foliosa. 
Heterotaxis crassifolia Cymbidium lancifolium 
GREEN HOUSE. 
Aloe saponaria latifolia. Stapelia elegans. 
-mitraeformis. —. divaricata. 
Stapelia vetula. -sororia. 
-stellaris. . crispa. 
■ reflexa. and others. 
Lagerstreemia Indica 
rosa. 
Polygala grandiflora. 
-cordifolia. 
Crinum saligua. 
Escallonia serrata. 
Gentiana saponaria. 
HARDY. 
Liatris sphseroidea. 
-■ ■■ ■■ scariosa. 
Lilium autumnale. 
Leucojum autumnale. 
AT MR. JOSEPH KNIGHT’S, KING’S-ROAD, CHELSEA. 
EXOTICS, FLOWERING JULY, AUGUST, & SEPTEMBER, 1831. 
Bellardiera, sp. nova, 
flowers blue; a beautiful free flow¬ 
ering climber. 
Gompholobium lanatum. 
a handsome free-flowering shrub. 
Gompholobium reticulatum. 
Cephalotus follicularis. 
flowered in July, this is the singular 
Pitcher-Plant, of New-Holland. 
Stylidium, sp. nova, 
handsome. 
Pimelia sylvestris. 
rare. 
V.—NATURALIST’S CALENDAR. 
FOR OCTOBER. 
BOTANY. 
The variety in the colour of the decaying foliage of trees and shrubs, at this season, cannot btit 
be an object of interest to every one, who has the least feeling for the works of Nature. Troei 
have not in general showy flowers; but this, in most of them, is amply compensated by the 
richness of their autumnal tints. Few flowers exceed in brilliancy the deep scarlet of thd 
Virginian Creeper, and few flowering shrubs are more gay than the Elm, in its bright yellow 
garment. Every species seems to have a colour or shade peculiar to itself, and by attending to 
these, they are readily distinguished from each other at sight. M. Prinsep, in the 4th Vol. of 
the Transactions of the Natural History .Society, at Geneva, hasdetailed some interesting exper¬ 
iments on the change of colour in leaves, He finds, that when leaves are shaded from the 
light, they do not change colour at all, but fall off’ green ; or that any part of a leaf which 
happens to be in the shade, does not change colour, though the remainder of the leaf does. The 
colouring matter he discovers to be a resinous substance, (which he calls Chromule,) common 
both to the green and yellow leaf. In the green state, it is soluble in fixed and essential oils; 
in the yellow state it is insoluble. The yellow Chromule, or the yellow leaf, if left for a 
length of time in alkali, is completely restored to its original beautiful green colour; and the 
green Chromule, or green leaf, if treated similarly with acid, acquires the yellow or red of thq 
decaying leaves. His conclusions, therefore, are, “ 1st,—that all the coloured parts of vege¬ 
tables contain a peculiar substance, (Chromule,) capable of changing colour by slight moditi- 
lications. 2nd,—That the autumnal colour of leaves is owing to the fi.xation of oxygen, and to 
a sort of acidification of the Chromule” 
Trees begin now to lose their leaves; the first frost strips the Ash, andthe rest scon follow. 
Most vegetables .seem preparing fora state of torpor; the shoots and blo.ssoms for the ensaing 
spring, are so well secured under the various coverings and varnish of the buds, that no cold 
can reach them, and they safely endure the utmost severity of winter. 
