CARDIACS — CAUSTICS. 215 



No. 3. Red nitrated quicksilver, or red pre- 

 cipitate. 

 No. 4. Burnt alum- 

 No. 5. Common verdigris. 



Remark — The strong caustics are gene- 

 rally sold in a convenient form for applica- 

 tion ; but the viild require to be finely 

 powdered and sprinkled on the ulcer: they 

 are sometimes mixed with digestive oint- 

 ments to increase their power. 



STRONG CAUSTICS, LIQUID. 



No. 1. The vitriolic and nitrous acids, which 

 are very powerful, and must be used cauti- 

 ously ; they may be diluted with different 

 proportions of water, so as to be applicable 

 to many purposes. 

 No. 2. Nitrous acid, one ounce. 

 Quicksilver, half an ounce. 



Place them in a large gally-pot, or open 

 phial, and take care to avoid the noxious 

 fumes which arise. When the quicksilver 

 is perfectly dissolved, and the mixture cold, 

 it may be put into a smaller phial and 

 corked. 



Remark — This is a strong and efficacious 

 caustic ; it is a certain remedy for the foot- 



