378 



GENERAL PHYSIOLOGY 



strong stimuli produce upon the branched pseudopodial filaments 

 of Rhizopoda. The two pictures agree completely ( Of. Fig. 169, A 

 and £). The dendrites of the neurons, for example in the brain of 

 a dog, like the pseudopodia of the rhizopods, assume a very 

 characteristic moniliform appearance in morphine- or chloral- 

 narcosis, their protoplasm accumulating in numerous small 

 globules and spindles. Evidently this phenomenon, which can be 



Fig. 170.' — Aniphlstegiyia Ussmiii. Filose pseudopodia project out througli the opening of the 

 lenticiUar, calcareous shell. A, Normal ; B, in chloroform-narcosis. 



produced only by an excitation of contraction, is an effect of the 

 stage of excitation which the narcotics, as we have seen, cause in 

 other forms of living substance before paralysis begins. In this 

 condition the ganglion-cells are gradually paralysed, and during 

 their narcosis preserve this form of pseudopodia. The same is 

 readily observed '^ also in the narcosis of Rhizopoda (Fig. 170), e.g., 

 AmpMstegi7ia, Orhitolites, Rhizoplasma, etc. 



1 Gf. Venvorn ('96, .S). 



