56 



Colonel Sir Aim roth E. Wright 



[March 



tube which Avas immei-.sed in hypertonic salt solution) the egg-albumen 

 was extensively digested, while in Tulie B there was only a mere 

 trace of digestion. 



Experiment 2. — I here try to imitate the conditions of slough- 

 covered wounds. I have in these beakers a foundation of coagulated 

 white of Qgg containing 0*5 per cent, of carbolic acid. On the top 

 of this I have in each case a disc of lint, woolly side up, fii-mly 

 fastened down by adding another layer of egg-albumen and coagu- 

 lating this by heat. Upon the lint I have poured a non-tryptic pus, 

 giving, of course, an equal amount to each beaker. In this way I 

 have made what I think can pass as a fairly close representation of 



Fig. 1G. — Beakers containing coagulated egg-albumen into which 

 is imbedded a layer of lint. Upon the lint was poured pus, and upon 

 this in the case of Beaker A hypertonic, and in the case of Beaker B 

 normal salt solution. In Beal^er A the artificial slough has separated 

 off l)y tryptic digestion. 



a pus-impregnated slouu'h tirndy adherent to the floor of ;i wound. 

 (Fig. K;, a and B.) 



We now pour upon one of the artificial sloughs 5 per cent. ; 

 upon another 0*85 per cent, solution made up with \ per cent, 

 carbolic acid ; and we may pour upon a third Dakin's solution. AVe 

 now place them all in the incubator. You see here what has 

 happened after 24 hours. In Ikaker A, where the artificial slough 

 has been treated with hy])ertonic salt solution, the slough has 

 loosened itself from its l)ed, and floats up as I pour in water. In 

 lieaher JJ, where I imposed only physiological salt sohition, the 

 slough is still firmly adherent. And the same holds of llealcer C (not 

 figured), where we have Dakin's solution. 



We have here, as you see, an instructive experiment. And we 



