. Carnegie Institution of Washington publication. FIG. 5.—Palolo larva "cir- cling" in a magnesium FIG. 6.—Paths of Palolo larvae in a Petri dish. It is remarkable that whatever the effects of the cations we are here considering may be upon the neuro-muscular system, their effect upon the movements of cilia are the exact opposite. EFFECTS OF SODIUM. A molecular NaCl solution is a primary neuro-muscular stim- ulant, but its effect upon the ciliary movements of Infusoria, worm- larvae, Veligers, Semper's Actinian larva, and Ctenophorae is to derange and inhibit without i
. Carnegie Institution of Washington publication. FIG. 5.—Palolo larva "cir- cling" in a magnesium FIG. 6.—Paths of Palolo larvae in a Petri dish. It is remarkable that whatever the effects of the cations we are here considering may be upon the neuro-muscular system, their effect upon the movements of cilia are the exact opposite. EFFECTS OF SODIUM. A molecular NaCl solution is a primary neuro-muscular stim- ulant, but its effect upon the ciliary movements of Infusoria, worm- larvae, Veligers, Semper's Actinian larva, and Ctenophorae is to derange and inhibit without initial stimulation, so that ciliary movement ceases usually in a few seconds, although in rare instances slight ciliary move- ment may continue in this solution for 20 minutes. In other cases, such as those observed by Prof. R. S. Lillie in Arenicola larvae and in Mytilus, the cilia rapidly dissolve in NaCl. It is remarkable that while. 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 Carnegie Institution of Washington. Washington, Carnegie Institution of Washington
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