STRUCTURE OF COLORED BLOOD- CORPUSCLES. 71 



It appears as though the net- work is most plain in corpuscles 

 that have suffered either not at all or but little from detach- 

 ment of a portion of their substance. The active changes of 

 indentation and protrusion have usually disappeared in a large 

 number of corpuscles, by the time " paling n has sufficiently 

 progressed to render the interior structure visible. As before 

 stated, some corpuscles permanently retain scalloped and 

 knobbed forms, while the majority are finally more or less 

 rounded off ; but the play of changing shape of many corpuscles 

 is going on at the same time that this net- work is seen. 



After a while, further " paling" stops, and the net- work 

 structure of all corpuscles which show it, remains visible 

 indefinitely long. 



Blood-corpuscles, from hemorrhage in the bladder, in the 

 urine of the late Dr. H****y, preserved with some bichromate of 

 potash, still show the net- work after three years. 



Specimens of blood taken from different individuals exhibited 

 all the phenomena described, but with some slight differences 

 among each other as to the order and time of appearance. 



A 40 per cent, saturated solution of bichromate of potash, 

 admixed with the blood, was found entirely satisfactory for the 

 demonstration of all the phenomena ; and some variation of 

 strength i. e., between the limits of a 35 per cent, and a 50 per 

 cent, saturated solution made no appreciable difference. 



Of other solutions of bichromate of potash, it is sufficient to 

 state the following : 



With a 30 per cent, saturated solution, the phenomena are 

 also to be seen, but appear more slowly, and quite a number of 

 corpuscles usually remain more or less unpaled. 



With a 20 per cent, saturated solution, the changes proceed 

 still more slowly; comparatively few indentations occur; the' 

 net- work of the majority of corpuscles is visible after the lapse 

 of twenty-four hours, but many remain entirely unaffected. 



With a 10 per cent, saturated solution, vacuolation appears, 

 also a little changing indentation and protrusion, but not suf- 

 ficient paling to render the net-work visible even after several 

 days. 



With a 60 per cent, saturated solution, the majority of the 

 corpuscles had already become pale by the time the specimen 

 was in place for examination. Some showed interior net- work, 

 some only double-contoured rings. Protrusions were seen, 



