40 
INDIA-RUBBER COURT-PLASTER. 
dia-rubber is better than that which has assumed a black co- 
lor by exposure to the air. 
I have tried various adhesive materials, but find the one 
I have mentioned to be the best. The grand arcanum in 
making court-plaster is glue and isinglass. The polishing 
coat is not absolutely necessary, but it improves the appear- 
ance of the plaster, and the gums may probably increase its 
healing property, and by giving it a more even surface cause 
it to adhere more closely. It has occurred to me, that a 
similar plaster might be made for common use with calico 
instead of silk, which might, in some cases, supersede the 
use of strapping ; and also that the adhesive material might 
be made the vehicle for cantharidine or other stimulants. 
The isinglass plaster is apt to crack in warm dry weather, 
but this does not occur if it is kept in a cellar in an earthen- 
ware jar. J bid. 
