Modern problems of biology / [Charles Sedgwick Minot].

  • Minot, Charles Sedgwick, 1852-1914
Date:
1913
Catalogue details

Licence: In copyright

Credit: Modern problems of biology / [Charles Sedgwick Minot]. Source: Wellcome Collection.

    37/152 (page 17)
    --3 5 6 for the explanation of life until we shall know how the chemical alterations go on in the living substance, which is a highly complicated mixture of many organic combina- tions of various sorts, all carried by great quantities of water. A good example of the complica- tion of the phe- nomena is offered us by the condition of the nucleus in certain unicellular organisms. In the cells of the highest plants and ani- mals the nucleus is always a simple unit, but there are many species of protozoa known in which the nucleus is double, so that there appear to be two nuclei of un- equal size. Fig. 12. Fig. 12.—A unicellular animal, an infusorium (Nassala -r. i i elegans). Natural length o.i mm. 9, Macronucleus; as een is micronucleus.—After Scheiviakoff, from Lang's covered that the Vergleichende Anatomic. larger nucleus plays a role in the nutrition and growth of the cell while the smaller nucleus has assumed exclusively the functions which lead to the division of the cell. Nature makes here for us an experiment in that she has separated in space the