ACTION ON BLOOD-PRESSURE AND CILIARY MOTION. 40S 



Experiment XIV. 



A piece of fresh cat's liver was placed in a solution of casca 

 of the same strength as that used in the preceding experiment ; 

 but the watery extract was used instead of the alcoholic. At 

 the end of two days the liquid was found to be crowded with 

 Bacteria. 



Tins experiment was afterwards repeated with muscular and 

 other tissues with the same result. 



Effect on the Life of Bacteria. 



The effect of the drug on the life of Bacteria, when developed; 

 was tried in Experiment Xo. XV. For this purpose an infusion- 

 of hay was made, and found to contain many rod-shaped Bacteria. 

 To a drop of this infusion a drop of a solution 1 in 20 of both the 

 alcoholic and the watery extracts of casca was added at different 

 times, and the movements of the Bacterians carefully watched 

 under the microscope. They did not, however, seem in any way 

 affected by the addition. 



For the sake of comparison a solution 1 in 100 of quinia sul- 

 phate was added to the hay-infusion. The Bacterian movements 

 were found to be instantly stopped. 



Effect on Red and White Blood-corpicscles. 



In Experiment XVI the action on the red and colourless 

 blood-corpuscles of the newt was investigated. The effects pro- 

 duced by the addition of dilute solution of casca to the blood 

 w^ere cessation of amoeboid movements and rounding of the 

 white corpuscles, with an irregular shrinking of the nucleus, 

 and general crenation of the red ones. These effects were pro- 

 bably due to the action of the tannic acid contained in the 

 extract. 



Effect on Ciliary Motion.] 



The drug appears to have no action on ciliary motion ; for 

 when (Experiment XVII) two preparations of ciliated epithe- 

 lium were made, the one being placed in *75 per cent, salt 

 solution, and the other in a -jf^ solution of casca extract, it waa- 



