34 M. Mohl on the Power of the Living Plant Betula intermedia, Thorn. B. fruticulosa, Valil ? Thing-valla. B. nana. Thingvalla. Salix glauca, Linn., not Sm, Reine-valla-hals. S. phylictfolia. Thingvalla. S. lanata. S. pyrenaica var. norvegica, Fries. Reinevalla-hals. S. herbacea. OrchidacecB. Orchis latifolia. Habenaria viridis. H. hyperborea. Melanthacece. Tofieldia palustris, Huds. Juncacece. J uncus balticus. Is this the /. effu-sus of Hooker's Fi., or J. arcticus ofVahl'sList? J. supinus. J. bufonius. J. trifidus. J. triglumis. Luzula spicata. L. multiflora. Alismacece. Triglochin palustre. Aroidece. Sparganium natans. Potamogetonece. Potamogeton lanceolatus, Sm. P. nigrescens, Fries. P. filiformis. Maria Havn, Hval Fiord. Zostera angtistifolia, Reich. Cyperacece. Scirpus csespitosus. Eleocharis uniglumis. Eriophornm capitatum. E. polystachion y. elatius, Koch. Elyna spicata. Carex dioica. C. chordorhiza. Maria Havn, Hval Fiord. C. incurva. C. curta. C. atrata. C. capillaris. C. vaginata. C. rariflora. C. cryptocarpa, Meyer. C. filipendula, Drej. C. vulgaris, Fries. C. hyperborea, Drej. C. rigida. Graminea. Anthoxanthum odoratum. Alopecurus geniculatus. Phleum commutatum. Agrostis alba. Arundo stricta. Near the Geysers and at Maria Havn, Hval Fiord. Sesleria caerulea. Aira alpina. Trisetum subspicatum /3. ciliatum. Poa annua. P. pratensis. P. alpina. P. Balfourii, Parn. P. caesia. P. ccesia /3. glauca. Festuca ovina. F. rubra y. arenaria. Equisetace.ee. Equisetum umbrosum. Thingvalla, E. palustre. Filices. Polypodium Dryopteris. P. Phegopteris. Woodsia ilvensis. Athyrium Filix-fcemina. Cystopteris fragilis a. C. fragilis /3. dentata. Botrychium Lunaria. Lycopodiacea?. Lycopodium selaginoides. VIII. — On the Power of the Living Plant to restrain the Eva-poration of the Cell-Sap. By Hugo v. Mohl*. It is a known fact, attested by numerous weighings, that the living plant, when exposed to light (even diffused daylight, * Botanische Zeitung, May 7, 1847. Translated by Arthur Henfrey.
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