190 Naturalist's Calendar. 
AT MESSRS. RONALDS & SON'S, BRENTFORD. 
GBEEN HOUSE. 
Lithospermum scan- Liniim maritimum. Salpiglossis atropurpu. Poppy Anemones, fine, 
dens. Asclepias tuberosa. reus, in variety. sown in March. 
Trachelium coeruleum. Glartiolus psitticina. 
HAKDY. 
Galinsogrea triloba. Stephania. Georgiatia. King of the Whites. 
Silene picta. Splendida. William IV. Cora. 
Lupinus Barclayana. Zelinda. Queen Adelaide. Julia. 
Hibiscus Africanus. Foster's Constantia. Prince George. Lady Osborn. 
DAHLIAS. Well's Bellona. Surpass Triumph-royal Queen of Roses. 
Lady Liverpool. Densa. Philip the First. Mountain of Snow. 
Summit of Perfection. Queen of August. Foster's Seedhng. Globe Pink. 
Eminent. Albania. Firabriata Surpass. Nymphifolia. 
Electra. Crimson Turban. Globe Orange. Alba Multiflora. 
Black Prince. Banatt's Susanna. Herschel. Lady Fitz-Harris. 
Indiana. Bona Dea. Dwarf Rubella. Scarlet Donna Maiia. 
AT MESSRS. C. LODDlGES & SONS', HACKNEY. 
HOT HOUSE. 
Testudinaria Lagunien Zygopetelon maxillaris Epidendrum elongata. Maranta cuspidata. 
Justicia venuti. Mackai. cochleatum. comosa. 
Sinningia villosa. crinitum. polybulbosa Dendrobium Squallis. 
Helleri. Bletia vericunda. Cypripedium venustum Pleurothallis racemi- 
Jasminuin])aniculatum Stylis micrantha. insigne. flora. 
Vanda rostrata. Liparis foliosa. Heterotaxis crassifolia Cymbidium lancifolium 
GREEN HOUSE. 
Andromeda sinensis. Aloe saponaria latifolia. Stapelia elegans. Lagerstrcemia Indica 
Hibiscus pedunculatus mitrasformis. divaricata. rosa. 
Kalmia hirsuta. Stapelia vetula. sororia. Polygala grandiflora. 
Wilsonia corymbosa. stellaris. crispa. cordifolia. 
Vernonia flexuosa. reflexa. and others. Crmum saligna. 
Guidium simplex. 
HARDY. 
Escallonia serrata. Liatris spha?roidea. Lilium autumnale. 
Gentiana saponaria. — scariosa. Leucojum autumnale. 
AT MR. JOSEPH KNIGHT'S, KINGS-ROAD, CHELSEA. 
EXOIICS, FLOWERING JULY, AUGUST, & SEPTEMBER, 18.31. 
Bellardiera, sp. nova. Gompholobium reticulatum. Stylidium, sp. nova, 
flowers blue ; a Deautiful free flow- Cephalotus folliciilaris. handsome. 
enng climber. flowered in July, this is the singular Pimelia sylvestris. 
Gompholobium lanatum. Pitcher-Plant, of New-Holland. rare, 
a handsome free-flowering shrub. 
v.— NATURALIST S CALENDAR. 
FOR OCTOBER. 
BOTANY. 
The variety in the colour of the decaying foliage of tree* and shrubs, at this season, cannot but 
be an object of interest to every one, who has the least feeling for the works of Nature. Trees 
have not in general showy flowers ; but this, in msst of them, is amply compensated by the 
richness of their autumnal tints. Few flowers exceed in brilliancy the deep scarlet of the 
Virginian Creeper, and few flowering shrubs are more gay than the Elm, in its bright yellow 
garment. Every species seems to liave 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, has detailed 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 ofl" 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 C/iromule,) common 
both to the green and yellow 'eaf. In the green state, it is soluble in fixed and essential oils; 
in the yellow state it is inaoluble. The yellow Chromule, or the yellow leaf, if left for a 
length of time in alkali, is completely restored to its origmal beautiful green colour : and the 
green Chromule, or green leaf, if treated similarly with acid, acquires the yellow or red of the 
decaying leaves. His conclu.sions, therefor^, are, " 1st, — that all the coloured parts of vege- 
tables contain a peculiar substance, (Chromule,) capable of changuig colour by slight modili- 
firations. 2nd, — T:iat the autumnal colour of leaves is owing to tlie ti.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, and the rest soon fo'low. 
Most vegetables seem preparing for a state of torpor; the shoots and blossoms 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 tttmost severity of winter. 
