PLATK LXXIX. 



FIG. 190. Test tube, with foot, used for subsidence of small quantities of blood ( i). 



FIG. igi.-Vessel of tin plate for collecting blood and keeping it at OOC ( 2). 



FIG. 192. Coagulation of blood of frog in a fine capillary tul>e. Hartnack. (Obj. 9; immersion. Oc. 3.) 



FIG. 193. a. Cannulr. for Schafer's experiment. 6 shows the form into which a tube is drawn out for the 

 preparation of an arterial oaunula ( 9); the tube is first severed at one of the constrictions, and then filed 

 away in the direction of the oblique line. c. T-shaped arterial cannulu; the horizontal tube is in communica- 

 tion with the manometer of the kymograph ( 33). 



FIG. 194. Object-glass for studying the action of induction shocks on blood. The drop of blood to be exa- 

 mined is placed between the tinfuil points on the under surface of the fixed square cover-glass. The chamber 

 is closed by placing a second ordinary object-glass below it ( 13). 



