General physiology; an outline of the science of life . nnularia) was in thefield of sight, and, since in the lightit gave off oxygen by reason of theactivity of its chromophyll, it was closely surrounded by a wall ofmotionless Spirochetal. In the other parts of the field almost noSpirochcetce were visible. The diatom suddenly moved a littledistance, and then lay still. The Bacteria, thus separated fromtheir source of oxygen, lay quiet for a few moments; but soon anactive movement began among them, and they swam in densecrowds again to the diatom. After one or two minutes almost allwere congre
General physiology; an outline of the science of life . nnularia) was in thefield of sight, and, since in the lightit gave off oxygen by reason of theactivity of its chromophyll, it was closely surrounded by a wall ofmotionless Spirochetal. In the other parts of the field almost noSpirochcetce were visible. The diatom suddenly moved a littledistance, and then lay still. The Bacteria, thus separated fromtheir source of oxygen, lay quiet for a few moments; but soon anactive movement began among them, and they swam in densecrowds again to the diatom. After one or two minutes almost allwere congregated again about it in a dense mass, and motionlessas before (Fig. 211, J). Engelmann has recently figured similarobservations (Fig. 211, 11 and III). The striking and systematic investigations of Pfeffer (84/88) uponchemotaxis had their starting-point in observations on the sper-matozoids of ferns, in which chemotactic relations to the egg-cellwere found. It is now known that analogies to this exist in almost 1 Cf. p. 217. - Cf. Verworn (89, 1). F F. Fig. 210.—Leucocyte devouring a bac-terium of splenic fever. (AfterMetschnikoff.) 434 GENERAL PHYSIOLOGY all organisms, and function as the indispensable condition of thefertilisation of the egg-cell by the spermatozoon in animals as in
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