(15) Ifµ be the refractive index of the medium as modified by the particles, that of the original medium being taken as unity, then 6=(µ - I)dx, and µ - I =nT(D' - D)/2D..
If µ' denote the refractive index of the material composing the particles regarded as continuous, D'/D =µ' 2, and µ = 2 nT 0 2 ' 2 - I), (17) reducing to µ - I =nT(µ' - i),..
Chromatophores.The chromatophores or plastids are protoplasmic structures, denser than the cytoplasm, and easily distinguishable from it by their color or greater refractive power.
In young cells the chromatophores are small, colorless, highly refractive bodies, principally located around the nucleus.
In the epidermal cells of the leaf of species of Vanilla (\Vakker), and in the epidermis of different parts of the flower of Funkia, Ornithogalum, &c. (Zimniermann), highly refractive bodies of globular form, elaioplasts, which consist of a granular protein ground-substance containing drops of oil.
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