. Contributions from the Botanical Laboratory, vol. 7. Botany; Botany. 190 Seifriz The alveolar structure of protoplasm 191 While I had no proof of it at the time, the only explanation of these apparently contradictory facts is the assumption of the presence of minute invisible vacuoles (or alveoli) in the highly viscous protoplasm. In these vacuoles the active particles are, presumably, suspended. Mast (32) has made similar observations and comes to the justi- fiable conclusion that, since the movement of granules in the "plas- magel" (the ectoplasm) of Amoeba is restricted, that is
. Contributions from the Botanical Laboratory, vol. 7. Botany; Botany. 190 Seifriz The alveolar structure of protoplasm 191 While I had no proof of it at the time, the only explanation of these apparently contradictory facts is the assumption of the presence of minute invisible vacuoles (or alveoli) in the highly viscous protoplasm. In these vacuoles the active particles are, presumably, suspended. Mast (32) has made similar observations and comes to the justi- fiable conclusion that, since the movement of granules in the "plas- magel" (the ectoplasm) of Amoeba is restricted, that is, the particles do not progress beyond the boundaries of a very small area, and since the ectoplasm is of ''gel" consistency, the only pos- sible deduction is ''that the plasmagel contains a rigid frame- work with numerous spaces filled with substance which has the properties of a fluid in which the granules are ; It would thus appear that in Amoeba we have in the plasmagel a typical Biitschlian alveolar structure (33). The fact that Mast believes alveolar protoplasm to be present in the plasmagel of Amoeba even though this structure is not visible harps back to Butschli's contention that, while it is true "that living. Fig. 8. Fibroblast showing vacuole containing granule in active Brownian movement and 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 University of Pennsylvania. Botanical Laboratory. Philadelphia : University of Pennsylvania Press
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