. The cell; outlines of general anatomy and physiology. is caused by their presence. They consist of a proto-plasmic substratum which may assume very various forms, oc-curring sometimes in the shape of a spindle and sometimes of asickle, a triangle or a trapezium. In this substratum crystals ofcolouring matter are deposited. In this case also colourless tro-phoplasts may, in suitable objects, be seen to develop graduallyinto colour granules. Further Weiss has observed spontaneousmovements and changles of form in these granules also. We will conclude this review of the various kinds of tropho-p
. The cell; outlines of general anatomy and physiology. is caused by their presence. They consist of a proto-plasmic substratum which may assume very various forms, oc-curring sometimes in the shape of a spindle and sometimes of asickle, a triangle or a trapezium. In this substratum crystals ofcolouring matter are deposited. In this case also colourless tro-phoplasts may, in suitable objects, be seen to develop graduallyinto colour granules. Further Weiss has observed spontaneousmovements and changles of form in these granules also. We will conclude this review of the various kinds of tropho-plasts by describing in more detail the structuie of the starchgrains, which have acquired considerable theoretical importancein consequence of Nagelis (V. 17, 20) researches, and the con-clusions which have been deduced from them. The starch grains (Fig. 69) in a plant cell may vary consider-ably as to size. Sometimes they are so small that even with thestrongest powers of the microscope they only appear as minute THE VITAL PROPERTIES OF THE CELL 163.
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Keywords: ., bookcentury1800, bookdecade1890, bookidcelloutlines, bookyear1895
