1902.] 



' Maze-currents " of the Crystalline Zens. 



205 



The lens is submitted to compression, after which there is no 

 response of any kind, either total or partial ; it is placed for a few 

 minutes in hot water until coagulated white, and again tested without 

 any response. The temperature at which the first obvious sign of 

 coagulation was observed was 38°. The lens was completely white 

 at 48°. Beyond 50° no further increased whiteness could be seen. 



I conclude from this and similar experiments — 



1. That a crystalline iens of suitable size is a good object upon 



which to study the nature of blaze-currents. 



2. That a " blaze-current" is a physical sign of the " living" state. 



3. That a blaze-current may be post-kathodic as well as post-anodic, 



antidrome as well as homodrome. 



4. That the direction of blaze-currents in the lens is negative or 



ingoing, i.e., from external or anterior to internal or posterior 

 pole. 



Added December 4, after the Eeceipt of Dr. Durig's Paper. 



(See p. 212.) 



Exp. 25. Nov. 1. Owl. — Positive responses of the anterior half of 

 the eyeball; negative responses of the lens alone; positive responses 

 of the cornea alone. 



1st eyeball. Anterior half. 7 minutes^/ mortem. 



Initial current = - • 0008 to - • 0018 volt. 



Exc. by single break 1 000 + + • 0005 

 „ ' „ +0-0005 



5000+ +0-0020 

 + 0-0015 

 + 0-0015 

 + +0-0015 



Lens alone. 



10000+ -0-0005 



0-0020 



Cornea alone. 



Single break 10000+ nil. 



10000- nil. 



Several 10000+ +0-0012, +0-0010 



10000- +0-0020, +0-0020 



Tetanisation 10000+ +0-0015 



10000- +0-0025 



Cornea plunged in hot water. 



Tetanisation 10000- nil. 



10000+ +0-0005 



