34 



INJURY, RECOVERY, AND DEATH 



solution until a reading is to be taken, when the solution 

 is allowed to drain off and the reading is made. Care 

 should be taken to prevent the current from leaking 

 through or around the stopper. 



The part of the frond which is contained in the stop- 



A Be 



D. 



Fio. 9. Two glass cells, 

 A and B, each provided with 

 an electrode with a strip of 

 tissue stretched between. 



FIG. 10. A disk of hard rub- 

 ber, A, one of tissue, B, and 

 one of celluloid, C, tied to- 

 gether with rubber bands, D 

 (all seen in section). Surface 

 view at the left. 



-n 



FIG. 11. Disk of hard 

 rubber, D, with a mass 

 of tissue, M, wedged in 

 the central opening (seen 

 in section). 





per and in the cell may be killed to lessen its resistance. 

 Material which is too soft to be handled in the man- 

 ner recommended for Laminaria may be treated as 

 follows : If it forms sheets or membranes it may be fas- 



