The cell in development and inheritance . Fig. 7 — Spermatogonia of the salamander. [Meves.]Above, two cells showing large nuclei, with linin-threads and scattered chromatin-granules; ineach cell an attraction-sphere with two centrosomes. Below, three contiguous spermatogonia,showing chromatin-reticulum, centrosomes and spheres, and sphere-bridges. be surrounded; but it must be remembered that the cell-wall in somecases arises by a direct transformation of the protoplasmic substance,and that it often retains the power of growth by intussusception likeliving matter. It is unfortunate that some
The cell in development and inheritance . Fig. 7 — Spermatogonia of the salamander. [Meves.]Above, two cells showing large nuclei, with linin-threads and scattered chromatin-granules; ineach cell an attraction-sphere with two centrosomes. Below, three contiguous spermatogonia,showing chromatin-reticulum, centrosomes and spheres, and sphere-bridges. be surrounded; but it must be remembered that the cell-wall in somecases arises by a direct transformation of the protoplasmic substance,and that it often retains the power of growth by intussusception likeliving matter. It is unfortunate that some confusion has arisen in the use of theword protoplasm. When Ley dig, Schultze, Briicke, De Bary, andother earlier writers spoke of protoplasm, they had in mind onlythe substance of the cell-body, not that of the nucleus. Strasburger, GENERAL MORPHOLOGY OF THE CELL 21 however, in 1882, extended the term so as to denote the entireactive cell-substance, including the nuclear material, suggesting thatthe latter be called nucleoplasm, and t
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectcells, bookyear1902
