272 The Structure of Colored Blood- Corpuscles. 



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

 mate of potash, still show the network after three years. 



Specimens of blood taken from different individuals exhib- 

 ited all the phenomena described, but with some slight differ- 

 ences 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 

 network of the majority of corpuscles is visible after the lapse 

 of 24 hours, but many remain entirely unaffected. 



With a 10 per cent, saturated solution, vacuolization ap- 

 pears, also a little changing indentation and protrusion, but 

 not sufficient " paling " to render the network 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 network, 

 some only double-contoured rings. Protrusions were seen, 

 especially in the corpuscles not much paled ; in one instance, 

 a pale ring was also seen with a large pedunculated protrusion 

 (fig. 6). During two hours, changes of scalloping and of 

 knobs took place faster than is usual with blood mixed with a 

 40 per cent, or 50 per cent, saturated solution, but they could 

 not be followed so distinctly. Extreme paling rapidly pro- 

 ceeded and much detritus filled the field, with only very few 

 compact globules. 



With a 90 per cent, saturated solution, the process of seal- 



