552 



Dr. J. O. W. Barratt. 



[July 20, 



represents a section of a portion of the ear of a healthy rabbit implanted 

 sub mite for 31 days (Experiment 3, Table II). It must therefore be con- 

 cluded that the dead prickle layer exerts a chemiotactic action, which is at 





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first acute, leading to the attraction of polynuclear leucocytes, and, later, 

 becoming less intense, affects mononuclear cells. The source of the latter 

 cells need not be considered here, since the experiments made do not throw 

 any new light upon their mode of origin, beyond the fact that mitoses of the 



