• Darwin Archive | 'Insectivorous plants': portfolios, 1860 - 1876 | Experimental treatments and observations, 1860-1862, 1871-1872 | Drosera rotundifolia [application of hair, toenail, sulphate of zinc, cyanide of potassium, opium, strychnine, chloroform, phosphate of ammonia, belladonna, veratrin, chalk, arsenious acid, phosphate of sodium, bichloride of mercury, carbonate of lime, prussic acid, henbane, acetate of strychnine, acetate of morphia, acetic acid], 1862-09-14 | Drosera rotundifolia [application of chloroform, phosphate of ammonia[?], acetate of morphia], 1862-09-14

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