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from the summit of Ætna, vindicate his pretensions as a sound and formidable critic.

HYDRAULIC ORRERY. Mr. Busby has recently opened an exhibition of an inventi. on of bis, the Hydraulic Orrery, which has excited considerable attention among the lovers of astronomy and of general science. The object of Mr. Busby's invention is not only to shew the various positions of the heavenly bodies at the different periods of their revolutions, but to produce a self-acting machine, that should imitate those silently gliding and harmoniaus movements which characterize the planetary revolutions. To effect these points, Mr. Busby bas provided a circular reservoir, five feet in diameter, in the centre of which a floating vessel bears the sun, elevated considerably from the surface of the Auid ; this vessel is made to revolve by the re-active impulse of water discharged in a minute lateral stream from a siphon. The earth and moon are also borne at equal elevations by floating vessels, and are similarly moved, excepting only the introduction of such mechanical modifications as were necessary to produce the parallelism of the earth’s axis, and the changing nodes of the moon's orbit.

The whole apparatus ultimately performs the annual orbit by means of a larger reacting siphon, which carries off the water previously used to effect the other movements. This apparatus, which is situated in the centre of the room, is purposely confined to the elucidation of the motions of the three bodies most interesting to us, viz. the sun, the earth, and the moon, but another machine, which equally deserves notice, imitates, in silent but perpetual harmony, the motions of Jupiter and his satellites. This is also a fijating apparatus ; but the most curious circumstances attending it are, that the whole is moved by a stream of rarefied air, produced by one small lamp, and that this lamp is so contrived as to impart a rotatory motion over a surface of wa.

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ter three feet in diameter, which being communicated to four floating rings, bearing the satellites, they are made to revolve at their proper distances about the primary and with velocities regularly diminishing, as in nature, and doubtless from similar mechanism. This invention has been honoured with a gold medal from the Society of Arts, and with a testimonial from some leading scientific characters, among whom are Drs. Hutton Gregory, and Kelly, and Messrs. Throughton, and T, and F. Bramah.-Investigator.

BOTANY. Plants in flower, in the Mission Garden, in the month of Febru

ary. Monandria Monogynia.-Canna indica, --coccinea---nepalensis,--coccinea var. maculata,--glauca,– limbata. Lopezia mexicana.

Diandria Monogynia.---Jasminum Zambac,--hirsutum, - pubescens ---arborescens ---grandiflorum --elongatum,lanceolarium,-bracteatum,--attenuatum. Justicia thyrsiflora, -nasuta ---speciosa,--Careyana,.-tinctoria,-.chinensis,Adhatoda,-decussata,-Gratiola grandiflora,--integrifolia, serrata.-Calceolaria pinnata. Stachytarpheta prismatica,jamaciensis,-mutabilis.

Triandria Monogynia--Hesperantha cinnamomea. Sparaxis grandiflora, two varieties. Ixia polystachia. Tritonia capensis,-crocata, -lineata,-longiflora. Gladiolus gracilis, -segetum. Antholyza äthiopica. Morea edulis,-collina. Iris sibirica. Sisyrynchium bermudianum.-micranthus. Commelina cælestis.

Tetrandria Monogynia.--Spermacoce tenuior. Ixora coccinea-Bandhuca,-alba,--rosea.

Pentandria Monogynia.—Heliotropium indicum. Lithospero mum officinale. Convolvulus gangeticus,--blandus,--purpureus,-bicolor. Ipomea sepiarea,-phoenicia. Plumbago

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rosea. Anagallis arvensis. Psychotria undulata. Coffea arabica, -bengalensis. Webera corymbosa. Gardenia latifolia, turgida,--dumetorum. Mirabilis Jalapa. Datura Stramonium. Nia cotiana Tabacum,--petiolata,--decurrens-angustifolia--glutinosa,--plumbaginifolia. Atropa physaloides. Solanum lycopera sicum,--Melongena -hirsutum,----stramonifolium,.-ethiopicum. Capsicum baccatum,--purpureum. Serissa foetida. Cestrum foetidissimum. Ehretia lævis. Mangifera indica. Viola primulæfolia,--tricolor,--cucullata. Impatiens Balsamina. Ce. losia cristata. Carissa Carandas,--diffusa. Ophioxylon serpen. taria. Cerbera Odallam,--fruticosa, Allamanda cathartica. Nerium odorum. Beaumontia grandiflora.

Pentandria Digynia.—Calotropis gigantea. Caucalis leptophylla. Dancus Carota. Coriandrum sativum. Anethum Sowa. Apium petroselinum,-involucratum. Cuminum Cyminum.

Hexandria Monogynia.Hippeastrum fulgidum,---fulgi. dovittatum,---equestre,--rutilum,- reginæ,--fulgido-rutilum, --rutilo-equestri-vittatum. Hymenocallis speciosa-amoena ovata-caribbæa. Allium striatum,-ascalonicum. Ornithaga lum candatum,-aureum. Albuca major---minor. Asphodelus clavatus. Anthericum annuum. Hyacinthus orientalis. Muscari botryoides. Lachenalia orchioides. Aloe obliqua. Loranthus bicolor.--globosus.

Octandria Monogynia.-Tropeeolum majus. Oenothera rosea,-tetraptera,-nocturna. Scytalia. Litchi.- Danura. Daphne viridiflora.

Decândria Monogynia.-Bauhinia purpurea. Cassia Tora alata. Poinciana pulcherrima. Cæsalpinia sepiaria. Hyperanthera Morungo. Melia robusta,--sempervirens. Garuga pinnata.

Decandria Digynia.—Saponaria vaccaria,--officinalis. Dianthus chinensis,--petræus,----asper,--sylvestris, ---diutinus,suaveolens.

Decandria Trigynia.-Silene patula. Stellaria media.

Decandria Pentagynia.--Oxalis versicolor,---cernua, -variabilis,-multiflora.

Dodecandria Monogynia.-Talinum reflexum.

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Dodecandria Trigynia. -Reseda odorata,-luteola. Euphorbia peplis,-terracina.

Icosandria Monogynia.-Cactus mamillaris,--stellatus. Amygdalis Persica,

Icosandria Pentagynia.-Spiræa corymbosa.

Icosandria Polygynia.-Rosa indica, -chinensis, -semper. florens,-involucrata, --centifolia. Mesembryanthemum cordifo, lium, chrystallinum. Rubus rosæfolius. Potentilla reptans, argentea.

Polyandria Monogynia.-Inga dulcis. Papaver somniferum. -Rhocas,-dubium. Argemone mexicana. Roydsia suaveo

lens.

Polyandria Trigynia.-Delphinium Ajacis.
Polyandria Polygynia.--Ranunculus cassubicus,

Didynamia Gymnospermia.-Lavandula multifida. Mentha quadrifolia. Leonurus tataricus. Leonotis Leonurus. Moluccella lævis.

Didynamia Angiospermia.-Penstemon companulata. Linaria minor,– tristis. Antirrhinum ørontium. Maurandia şemperflorens,-personata. Celsia coromandeliana. Volkamerią infortunata. Lantana aculeata, -trifolia, Stemodia ruderalis. Bigno. pia amena.

Tetradynamia Siliculosa. - Myagrum perfoliatum. Lepidium Thlaspi,--didymum.

Tetradynamia Siliquosa. --Cheiranthus Cheiri. Matthiola annua. Sinapis dissecta,-dichotoma, -rạmosa, -brassicata.

Monodelphia Triandria.-Ferraria undulata,--antherosa. Passiflora edulis,---laurifolia,-minima,--lutea.

Monodelphia Pentandria - Erodium moschatum.
Monodelphia Heptandria.—Pelargonium inquinans, capitatum.

Monodelphia Decandria.--Pentapetes phænicea. Astrapia Wallichia. Pterospermum acerifolium. Bombax pentandrum.heptaphyllum. Sida cristata. Malachra capitata,--heptaphylla. Malva hispanica. Hibiscus tiliaceus,—tortuosus.-Rosa si. nensis,-phoeniceus,--rigidus,-collinus,-mutabilis. Achania pilosa.

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Diadelphia Triandria.---Fumaria officinalis,-parviflora.
Diadelphia Octandria.- Polygala myrtifolia.
Diadelphia Decandria.- Butea frondosa. Erythrina indica,

- ovalifolia. Amorpha fruticosa. Crotalaria tenuifolia, retusa, -sericea,—verrucosa,capensis,-laburnifolia. Lupinus hirsutus. Phaseolus vulgaris. Dolichos gladiatus.-Lablab,--gangeticus. Clitoria ternata,-heterophylla. Pisum sativum. Lathyrus sativus. Sesbana grandiflora,-ægyptiaca. Psoralea co ryllifolia.

Polyadelphia Icosandria.-Citrus acida.

Polyadelphia Polyandria.--Hypericum monogynum.-Ascyron,-calycinum.

Syngenesia Æqualis.-Arnopogon picroides. Sonchus tingitanus, oleraceus. Prenanthus acaulis. Chicorium Endivia. - Intybus,-laciniata. Serratula anthelmintica,-cinerea, spec. from Nepala. Carthamus tinctorius.

Syngenesia Superflua.-Gnaphalium indicum,—depressum. Conyza repanda.-lanceolaria,—lacera. Tagetes patula,-erecta. Zinnia speciosa. Chrysanthemum indicum,-chinense. Anthemis cotula. Achillea magna,-heterophylla.

Syngenesia Frustanea.--Cosmea sulphurea. Helianthus annuus. Rudbeckia triloba. Calea oppositifolia. Centaurea floscula.

Syngenesia Necessaria.-Calendula officinalis. Parthenium Hysterophorus.

Syngenesia Segregata.–Naumbergia trinervata.

Gynandria Monandria.-Cymbidium hyacinthinum. Vanda Roxburgii.

Monoecia Hexandria.- Areca Catechu.

Monoecia Polyandria.-Saguerus Rumphii. Begonia malabarica,-patula.

Monoecia Monodelphia.—Jatropha multifida. Bradleia lanceolaria.

Monoecia Polyadelphia.--Momordica monodelpha. Luffa acutangula.

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