THE MICROSCOPE. 29 



as the part is exposed to the carbolated solution, no change in the 

 capillaries is observed. The current is also at first slightly ac- 

 celerated, but then becomes slower than normal, and so continues. 

 At first the normal peripheral and axial currents are observed. A 

 greater or less number of white cells may be seen rolling or gliding 

 along the walls and even adherent to them. Soon, however, the 

 peripheral zone becomes less and less distinct, and the axial becomes 

 broader. The white cells, which were as first attached to the walls 

 are loosened, and are carried off by the current. Those which drag 

 along the periphery are mostly globular, and exhibit but slightly the 

 well marked appearance of stickiness. This condition lasts as long 

 as the carbolated solution is applied, but the normal phenomena 

 will return if the carbolic acid be washed off with an indifferent 

 fluid. No structural changes could be seen in the white blood cells 

 which had been rendered quiescent in the vessels by solutions as 

 dilute as y^Vo- 



It is therefore, evident that even weak solutions of carbolic acid 

 have the power of checking the emigration of blood cells; and thus 

 a "part of its favorable action in restraining suppuration may be ac- 

 counted for, at least in so far as pus is the result of the emigration 

 of the blood cells." — Chicago Med. Journal and Examiner., from 

 A?n. Jour. Med. Sci. 



