1917] 



on The Treatment of War Wounds 



39 



like under the microscope. Instead of the leucocytes being* all, as 

 you will see in the next figure, congregated together behind the 

 starting line, they here are actively emigrating — the more active out- 

 distancing the others in the race. 



Fig. 6 shows what happens Avhen 5 per cent, salt solution is im- 

 posed upon the blood. That salt passes down by diffusion and arrests 

 emigration, and I want you to notice on the right of the figure 

 (and more clearly in the inset) that the few white corj^uscles which 

 were beginning to emigrate when the salt solution overtook them are 

 broken up and destroyed. By that trypsin will be set free. 





Fig. 6. — Magnified view of the leucocytic layer in the case where 

 strong salt solution was superposed upon the white clot. 



I next show you what happens when microbes have been implanted 

 into the blood. Those microbes — supposing always that they are the 

 sort that can proliferate in blood — grow out into colonies. In Fig. 7 

 is shown what happens when an excessive implantation has been 

 made, and the bacterial colonies come up very thickly in the blood. 

 You see here that emigration is entirely arrested. If that were to 

 happen in infected tissues it would mean that the organism was there 

 giving up the combat against the microbes. 



In Fig. 8 we have again streptococcus implanted into the blood, 

 but this time it is a much more sparing implantation. And here, as 

 you see, the leucocytes are carrying out a raid against the microbes, 

 each leucocyte ingesting and filling itself full with microbes. 



