30 



\'ET1;RIX.\R\' pa THnLOCTY. 



surrounding's. Leucocytic amoeboid movement is due to intra- 

 cellular protoplasmic circulation. Leucoc}-tic immigration prob- 

 abl}' is the result of chemic attraction, (positive chemotaxis), 

 which stimulates the circulating protoplasm within the cell to 

 constantly flow toward the point of greatest chemical affinity 

 and finall}' the cell reaches that point, Leucocytic emigration 

 is based upon the same principal except that the chemic in- 



fe 





m 



'1- Horee. 



Fig. IT). — Spermatozoa. 



