^6 THE JOURNAL OF PHARMACOLOGY. 



Medicated Gauzes. 



A. Boric Acid Gauze Dissolve 40 gtn. boric acid in 100 cc. boiling 



water (distilled). With this 10 m. of gauze, 0.7 m. wide, are thoroughly 

 impregnated by continued kneading until absorbed. The gauze must be 

 free from all fatty matter, and "when impregnated is spread on plates and 

 dried at about 25°C. One meter will contain 4 gm. boric acid, which is 

 equal to about iofo by weight. 



B. Carbolated Gauze. — Prepare a mixture of the following : 30 gm. 

 carbolic acid, 900 cc. benzine (S/G. 0.700), 100 cc. ether and 15 cc. paraffine 

 oil. With this impregnate 10 m. gauze, same as before. Dry and pack 

 in parchment or wax paper. In like manner, with addition of 4 gm. 

 resin, medicated gauzes of salicylic acid, salol, naphthol, iodol, resorcin, 

 picric acid, and corrosive sublimate, are prepared. 



C. Dermatol Gauze. — The usual quantity of gauze, 10 111.-0.7 m - 

 wide, is cut into a number of pieces, each of which must be impregnated 

 by itself. This becomes necessary because dermatol is not soluble in the 

 impregnating medium. This is made as follows : Mix 50 gm. dermatol with 

 900 cc. benzine (S/G. 0.700), ether 100 cc, paraffine oil 15 cc. and 5 gm. 

 resin. The same procedure can be employed in case of airol, sub-nitrate 

 and salicylate of bismuth. Each meter contains 5 gm. of medicinal sub- 

 stance, equal to about 20$ by weight. 



D. Iodoform Gauze. — 27.5 gm. iodoform, 400 cc. benzine (S/G. 0.700), 

 600 cc. ether, 10 cc. paraffine oil and 5 gm. resin are mixed. This mixture 

 is used to impregnate 10 111.-0.7 m - wide gauze in the aforesaid manner. 

 15-20 drops ammonia water may be added ; this serves to preserve color 

 of gauze. One meter contains 2.5 gm. = 10/c by weight of iodoform. 



G. C. D. 



Soluble Metallic Gold. 



Zsigmondi recently succeeded in producing solutions of metallic gold ; 

 these in color resemble ruby-glass and are obtained by treating faintly al- 

 kaline and very dilute solutions of gold chloride with formaldehyde. The 

 product so obtained is concentrated by dialysis, the gold remaining in so- 

 lution. Its colloidal nature in this condition, permits the removal in such 

 manner of nearly all the salts present. Gold would, therefore, seem to 

 share with many other metals the property of yielding colloidal solutions 

 when in a state of fine subdivision. Such subdivision must be made 

 under water, formaldehyde acting only as a reducing agent. 



If the red solution is treated with sodium chloride, or with dilute acids, 

 a blue color is produced, and it is found that the gold has aggregated into 

 larger particles. Addition of more salt, finally causes a separation of gold 



