A Catalogue of the Fifty Plants from Chelsea Garden, Presented to the Royal Society by the Worshipful Company of Apothecaries, for the Year 1757, Pursuant to the Direction of Sir Hans Sloane, Baronet, Med. Reg. & Soc. Reg. Nuper Praeses, by John Wilmer, M. D. Clariss. Societatis Pharmaceut. Lond. Socius, Hort. Chelsean. Praefectus & Praelector Botanic

eye and in the telescope. As the same causes obscured almost all the stars near it, I had great difficulty in fixing its place on the globe. It appears however, now, evidently, to be moving contrary to the order of the signs, and more considerably northwards, i.e. slowly retrograde, with a decreasing south latitude. Hampstead, May 6. 1759. N. M. XVII. A Catalogue of the Fifty Plants from Chelsea Garden, presented to the Royal Society by the worshipful Company of Apothecaries, for the Year 1757, pursuant to the Direction of Sir Hans Sloane, Baronet, Med. Reg. & Soc. Reg. nuper Praes, by John Wilmer, M. D. clariss. Societatis Pharmaceut. Lond. Socius, Hort. Chelsean. Praefectus & Praelector Botanic. Read May 3, 1801 1759. A Cinos Syriaca, folio tenuiore, capsulis hirtutis. Mor. Hist. 1802 Ægilops Lobelii. 1803 Ambrosia maritima. C. B. 138. Ambrosia quibusdam. J. B. 3. 190. 1804 Arum Zeylanicum humile latifolium, pistillo purp. Miller. 1805 Astragalus caulescens erectus pilosus, floribus spicatis, leguminibus subulatis pilosis, Lin. Sp. Pl. 756. 1806 1806 Cerastium, floribus pentandris, petalis integris, Loefl. Desc. 26. 1807 Chenopodium foliis lanceolatis carnosis, corymbis dichotamis spinosis, Lin. Sp. Plant. 221. 1808 Chironia frutescens capsulifera, Lin. Sp. Plant. 190. 1809 Clethra Linnæi Alnifolia Americana serrata, floribus pentapetalis albis, in spicam dispositis, Pluk. Alm. p. 18. tab. 115. fig. 1. Catesby, vol. 1. p. 66. tab. 66. 1810 Clinopolium orientale origani folio, fl. minimo, T. Cor. 1811 Delphinium nectariis dyphillis, labellis integris, floribus subsolitariis, foliis compositis lineari-multipartitis, Hort. Upsal. Delphinium elatius subincanum perenne, flor. amplis azureis, Amman. 132. 1812 Doria Americana lato rigido folio, Boerh. Ind. Alt. 98. Virga aurea ex Nova York, foliis symphtii majoris hirsutis, Schol. Botan. Par. 1813 Gallium album linifolium, Barrel. obf. 99. 1814 Galium caule erecto, foliis quaternis lanceolatis trinerviis, Fl. Lap. 60. Gallium album quadrifolium erectum, Celf. Upsal. 22. 1815 Galeopsis, sive Urtica iners, flore luteo, J. B. 1816 Genista ramis ancipitibus articulatis, foliis ovato-lanceolatis, Hort. Cliff. 355. 1817 Geranium Batrachoides Americanum maculatum, floribus obsolete purpureis, Hort. Elt. 158. 1818 Geranium pedunculis subunifloris, foliis quinquepartitis acutis, foliolis pinnatifidis, Lin. Sp. Pl. 685. Vol. LI. 1819 Gladiolus foliis linearibus sulcatis, caule bifloro, tubo longissimo, segmentis æqualibus, Miller's Dict. 1820 Glycyrrhiza filiquosa, vel Germanica, C. B. P. 352. 1821 Hydrangea, flor. Virgin. 50. 1822 Lamium foliis caulem ambientibus, C. B. 231. 1823 Larix orientalis, fructu rotundiori obtuso, T. 586. Cedrus magna sive Libani conifera, J. B. i. 277. 1824 Lotus maritima lutea filiquosa, folio pingui glabro, Bot. Monsp. 1825 Lychnis saponaria dicta folio convoluto, Gentiana concava, Ger. 253. 1826 Mandragora fructu rotundo, C. B. 169. Off. 300. 1827 Mespilus spinosa, pyri folio, H. Leyd. Pyracantha quibusdam. J. B. 151. 1828 Mespilus foliis lanceolatis ferratis, spinis robustioribus, floribus corymbosis, Miller's Ic. 1829 Mespilus foliis cordato-ovatis, acuminatis, marginibus acute ferratis, ramis spinosis, Miller's Ic. 1830 Mitella fcapo nudo, Hort. Cliff. 167. 1831 Oenothera foliis radicalibus ovatis, caulinis lanceolatis obtusis, capsulis ovatis sulcatis, Miller's Icons. 1832 Onobrychis major, filiculis echinatis, cristatis, in spica digestis, Mor. Hist. 2. 131. Onobrychis foliis viciæ, fructu echinato, major, C. B. 350. 1833 Orobus foliis conjugatis subfeffilibus, stipulatis, dentatis, Hort. Upsal, 220. Lathy- Lathyroides erecta, folio ovato acuminato, cæruleis viciæ floribus, et filiquis Siberica, Amman. Ruth. 151. T. 7. F. 2. 1834 Padus foliis oblongo-ovatis semper virentibus eglandulosis, Miller’s Icons. Laurocerasus Lusitanica minor Azarero Lusitanorum, Tourn. Inst. R. H. 628. 1835 Polemonium foliis pinnatis radicibus reptatricibus, Flor. Virgin. 22. 1836 Pulmonaria calycibus abbreviatis, foliis lanceolatis obtusiufculis, Lin. Sp. Pl. 135. Pulmonaria non maculosa foliis glabris, Americana flore patulo cæruleo, Pluk. Phyt. Tab. 227. Fig. 6. 1837 Salicornia, T. Cor. 51. Kali geniculatum, Ger. Em. 535. 1838 Senecio corollis radiantibus, foliis crenatis, infimis cordatis petiolatis, superioribus pinnatidis lyratis, Flor. Virgin. 1839 Serratula, C. B. P. 235. Jacea nemorensis, quæ Serratula vulgo, T. 444. 1840 Serratula foliis oblongo-ovatis, obtuse dentatis, caule ramoso patulo, calycibus subrotundis mollibus, Miller’s Dict. 1841 Spartium ramis oppositis angulatis, foliis oppositis subulatis, Lin. Sp. Pl. 708. 1842 Spiræa Africana odorata, foliis pilosis, Com. rar. 3. 1843 Stramonium Americanum maximum, flore albo, fructu rotundo spinoso, Tourn. 1844 Tilia foliis molliter hirsutis, viminibus rubris, fructu tetragono, Ray, Synop. 2. 316. Tilia hirsuta coryli foliorum æmula, fructu angulofo, Pluk. Mant. 181. O 2 1845 Tril- 1845 Trillium flore pedunculato cernuo, Lin. Sp. Pl. 339. 1846 Valeriana montana subrotundo folio, C. B. P. 165. 1847 Vicia pedunculis multifloris, petiolis polyphilis, foliolis lanceolatis glabris, Hort. Upsal, 219. 1848 Vicia sylvatica multiflora maxima perennis, tetro odore, floribus albentibus, lineis caeruleis striatis, Pluk. Alm. 387. 1849 Vinca foliis oblongo-ovatis integerrimis, tubo floris longissimo, caule ramoso fruticoso, Miller's Iconf. 1850 Xanthium, sive Lappa minor, J. B. 3. 572. Lappa minor, sive Xanthium Dioscorid. C. B. P. 198. XVIII. An experimental Enquiry concerning the natural Powers of Water and Wind to turn Mills, and other Machines, depending on a circular Motion. By Mr. J. Smeaton, F. R. S. Read May 3, & 10, 1759. WHAT I have to communicate on this subject was originally deduced from experiments made on working models, which I look upon as the best means of obtaining the outlines in mechanical enquiries. But in this case it is very necessary to distinguish the circumstances in which a model differs from a machine in large; otherwise a model is more apt to lead us from the truth