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The experiments of the authors with certain Graminaceae and Leguminosae did not indicate the assimilation of free nitrogen by- plants.
Eurther investigations are required upon the question, and also as to the sources whence combined nitrogen may be derived by vegetation.
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Eeferring to the histological character of the colouring sub- stance of the cells of the arillus, which occurs in the form of minute, elongated, and straight or curved granules of a bright scarlet colour.
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Details are given of the effects of Sulphurous and Hydro- chloric Acid, Chlorine, Sulphuretted Hydrogen, Nitrous and Car- bonic Oxide, and Coal Gas, on Laburnum, Balsam, and a Psoralea. As regards their action on plants, the author distinguishes the two classes of narcotic and irritant gases. Plants exposed to the former until the leaves begin to droop, although the colour remains unchanged, inevitably perish. In irritant gases the action is more local, affecting first the tips of the leaves, which become disco-
