. Physiological botany; I. Outlines of the histology of phænogamous plants. II. Vegetable physiology. Plant physiology; Plant anatomy. 40 THE VEGETABLE CELL IN appear to be much like the sphere-crjstals described in 18G. But if they are carefull}- treated with dilute lydrochloric acid, the chief part of the concretion disappears, leaving behind a delicate trace of cellulose which was intermingled with it. That this cellulose was an in- trusive growth into the cell from the wall, is shown bj- a studj' of its develop- ment. In most cases such concretions () are plainly- stal
. Physiological botany; I. Outlines of the histology of phænogamous plants. II. Vegetable physiology. Plant physiology; Plant anatomy. 40 THE VEGETABLE CELL IN appear to be much like the sphere-crjstals described in 18G. But if they are carefull}- treated with dilute lydrochloric acid, the chief part of the concretion disappears, leaving behind a delicate trace of cellulose which was intermingled with it. That this cellulose was an in- trusive growth into the cell from the wall, is shown bj- a studj' of its develop- ment. In most cases such concretions () are plainly- stalked, but in some instances thej' are onl}- obscurely stalked, and are with difflcultj- distin- guished from the ordinary cell concre- tions. In the leaf of Ficus elastica (see Fig. 6) the}- are more completely devel- oped than in any other common plant. 165. Otiier changes, chiefly those of degradation, maj- take place in the cell- viall, giving rise to products varfously known as gums, resins, &c. ; but in all these cases there is such a commingling of the cellulose derivatives with those formed from the contents of the cell, that they cannot be readily dis- tinguished. 166. Protoplasm, as was shown in the previous sections, gives rise upon its exterior to the cell-wall. Inside the cell, likewise, it produces, either directly or indirectlj-, various substances. In the present chapter these substances are to be considered onlj- so far as relates to their detection and identification. Most of them are to be examined later, with reference to their office in the life of plants. 167. Plastids. In the protoplasm of active cells certain gran- ules having substantially the same chemical and, with the excep- tion of their color, the same physical properties as protoplasm, are clearly differentiated. They are imbedded in the general protoplasmic mass, and are not separable from it b^- mechanical means. 168. Such grannies may be convenientlj' referred to three tj'pes,' depending upo
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