132 ON THE NATURE AND ACTION OF THE CROTALUS-POISON 



11.55. Cilia on the gills are still quite active. Those on the 

 ciliated bodies still moving, rather more actively than before. 



1.30. Cilia on gills have become much more sharply outlined. 

 Many are standing still, though many still move briskly. 



Experiment XXXV. 

 To another specimen a strong solution of cobra-poison was 

 added at 10.50. 



1.30. Cilia still moving. 



Experiment XXXVI. 



A third specimen was laid in an almost syrupy solution of 

 dried cobra-poison at 11.28. 



At 11.40 no effect observable. 



1.30. Some have stopped, but numbers are still moving quite 

 briskly. 



In this case the poison seemed not to have any action on the 

 ciliary motion. 



Experiment XXXVII. 



January 6th, 1875. — At 3.40 some diluted cobra-poison added 

 to Vallisneria. Circulation going on vigorously. About -^ grain 

 in 3 drops of water. 



3.58. The movements are unchanged. 



5 P.M. Movements going on as before. 



Experiment XXXVIII. 



Added some solution of cobra-poison at 4 P.M. to another 

 specimen of Vallisneria. 



4.10. No change. 



4.45. Circulation goes on vigorously. 



4.55. Perhaps rather less brisk in their movements. 



The results of these experiments show that cobra- virus must 

 be regarded as, to a certain extent, a poison to protoplasm, 

 seeing that it arrested with rapidity the movements in 

 Infusoria* {vide Experiments XXX, XXXI, and following). 



* Is this accounted for by the existence of a rudimentary nervous system 

 diffused throughout these two forms of life, and on which the poison could act ? 



