. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 274 JERKM1A1I S. FKRCU -MX. period the fibers had so increased in numbers that they neces- -arily laid in relation to the cells. The weak point in Merkel's deduction appears to be the dis- regard of the locomotive properties of mesenchymal or youn^ connective ti-Mie cells. If these cells, except for the incidents of mitosis, are stationary, then Merkel's observations would render conclusive evidence to support the theory of the extra- cellular origin of libers. But that such cells possess at least a limited power of motion s
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 274 JERKM1A1I S. FKRCU -MX. period the fibers had so increased in numbers that they neces- -arily laid in relation to the cells. The weak point in Merkel's deduction appears to be the dis- regard of the locomotive properties of mesenchymal or youn^ connective ti-Mie cells. If these cells, except for the incidents of mitosis, are stationary, then Merkel's observations would render conclusive evidence to support the theory of the extra- cellular origin of libers. But that such cells possess at least a limited power of motion simulating the anm-boid character has long been known. An adequate theory must account for the activity of these cells. Merkel's theory presupposes them to be stationary till fibers have appeared and only later to acquire amoeboid characters. In for a tissue which would offer opportunity for the study of the activities of connective tissue cells in the living SW1PM. Mf, £68. „ 6-/0 ^7 ^4 oJ L , VS^-A ^v/ FIG. I. •(> mm. long (one clay alter hatching). The figures record the moment of completion of each drawing, the whole ol>~er \-ati on extending over a period of minutes. The fish was afterward returned to water and swam for two days I" li'-iny killed I'll tiirther histoli .yical use. The cell observed corresponds in appear- ance with that -hown liy \\'. 1- i \r,h. I. Aunt., 1897, Fig. 9, Plate \"I.) in the me-entery of a Snlnni:itiil?r lai \ a. It slmws active amoeboid motion and ash e change- oi iiiim. It- locomotion was not recorded, it was (|itite limited. X 800, camera lucida. animal under normal conditions, 1 have found that the median tin o| voinr; lish embr\-o-> allonh a subject tor stud\' \\ hich throws on Merkel's Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of t
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
