. Biological lectures delivered at the Marine Biological Laboratory of Wood's Holl [sic]. Biology. Fig. io. the case with the large central vacuoles which I have mentioned as occurring in other species. The peripheral vacuoles in the next cells flow together (?r) and communicate with the central canal (Fig. ii). These side canals finally assume the form of bushes or trees, in which the stem represents the canal of communication with the cen- tral canal, from which stem are given off finer and finer branches to the periphery of the cells (Fig. 12, 0- As soon as the central canal is formed we no
. Biological lectures delivered at the Marine Biological Laboratory of Wood's Holl [sic]. Biology. Fig. io. the case with the large central vacuoles which I have mentioned as occurring in other species. The peripheral vacuoles in the next cells flow together (?r) and communicate with the central canal (Fig. ii). These side canals finally assume the form of bushes or trees, in which the stem represents the canal of communication with the cen- tral canal, from which stem are given off finer and finer branches to the periphery of the cells (Fig. 12, 0- As soon as the central canal is formed we notice new organs in these cells. All along the peri- phery we see, projecting into the interior of the cell, coarse short threads (staining deep red with Bordeaux red), each thread end- ing in a coarse knob, which stains intensely blue with haematoxylin (Fig. 13,/). The cell certainly is in a state of great activity, as is also shown by continual changes taking place within the nucleus. Figs. 14-19 show us nuclei as I have observed them in the upper part of the nephridium. Fig. 14 shows the chro-. FlG. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Marine Biological Laboratory (Woods Hole, Mass. ). Boston, Ginn & Co
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