Ointments. 489 



Blue oiktmext, Unction, Ung. ccBruleum. Argent, vivi ll>. j, 

 tereb. Vcnetae 3], axung. pore. lb. iv. 



Ung. c.eruleum fortius. Axung. pore. lb. ij, argent, vivi 

 lb. j, balsami sulph. sirapl. ^ss. 



Ung. CiERULEUM MiTius. Axung. pore. lb. iv, arg. vivi lb. j, 

 tereb. comm. 3J. 



Ceratum mercuriale. Cerae fl., axung. pore, ana lb. ss, 

 argent, vivi, pij, balsam, sulph. simp. 5J. 



Ung. hydrargyri fortius. Hydrarg. lb. ij, adip. suill. 

 5xxiij, sevi ovilli 5J. 



Ung. hydrargyri mitius. Ung. hydr. fort. lb. j, adip. 

 suill. lb. ij. 



Ung. hydrargyri, P. E. Argent, vivi, sevi ovilli, ana lb. j, 

 adip. pore. lb. iij. 



Ung. hydrargyri, P. D. Argent, vivi, adip. pore, ana lb. j. 



Strong mercurial ointment. Argent, vivi 61b., axungiae 121b. 



Weak mercurial ointment. Argent, vivi 2lb., axungiae 14lb. : 

 alterative, 3J to 5j of the strong, rubbed into the inside of the 

 thighs, omni nocte, in syphilis ; the weak used to kill vermin on 

 the body. 



Donovan's mercurial ointment. Rub calomel with aq. 

 potassa?, or dissolve quicksilver in nitric acid, and precipitate by 

 adding aq. potassa?, to obtain the protoxide of quicksilver. To 

 each drachm of this oxide add lard 5iiss, rub them together, and 

 then heat them to al)out 300 or 350 deg. Fahr., and keep stirring 

 them for two hours. Each oz. of lard takes up about gr. xxj of the 

 oxide, and l)ecomes of a grey colour. The exact degree of heat 

 is of consequence ; at 212 deg. the ingredients do not unite, at 400 

 i\vfr. or alKJve that heat the oxide is decomposed, and red oxide or 

 even metallic quicksilver separates. If the lard contains common 

 salt, calomel will be formed, and the operation will not succeed. 

 Much more powerful than the common mercurial ointnient ; it 

 lx?ing sufficient to rub in only 5j. 



2. By melting common mercurial ointment in a water bath, let-, 

 ting it cool slowly, and separating the upper grey stratum. By 

 rubbing the heavy residue with magnesia alba, the greater part of 

 the quicksilver in the blue ointment will be recovered, as it was 

 never chemically united. 



3. By ex]X)smg ung. oxid. hydr. cinerci to a heat of about 300 

 degrees for some liours. 



Mar.sh.mam.ow ointment, Ung. ex nlt/uen. Ol. c mucilagini- 

 bus lb. iij, cerae fl. lb. ss, resinse fl. lb ss, tereb. comm. jij. 



