QUESTIONS AND ANSWERS 309 



to dilate the pupil and paralyze accommodation for purposes of 

 refraction ; to prevent or break up adhesions of the iris and inflam- 

 matory conditions of the cornea. Atropine, the active principle 

 of belladonna, is generally used in this work. 



Give the source of atropine and describe its action. 



Atropine is an alkaloid obtained from belladonna. It is the chief 

 alkaloid of this drug and represents its action. (See answer to 

 preceding question.) 



Name five antiseptics for wounds and give the strength in which each 

 should be used. 



Corrosive sublimate, 1-1000 to 1-2000. 



Phenol, 3 to 5 per cent, solution. 



Creolin, 1 per cent, solution. 



Hydrogen peroxide, 50 per cent, solution or undiluted. 



Lysol, % to 2 per cent, solution. 



Mention four preparations of iron and state the dose of each for (a) 

 the horse, (b) the dog. 



Ferrum reductum, (a) 1 to 3 drachms, (b) 1 to 5 grains. 

 Ferri sulphas, (a) i^ to 1 drachm, (b) 1/2 to 2 grains. 

 Tr. ferri chloridi, (a) 2 to 8 drachms, (b) 2 to 20 minims. 

 Ferri hydroxidum cum magnesii oxide, (a) 8 ounces, (b) 4 

 drachms. 



State how benzoated lard is prepared and give its uses. 



Adeps benzoinatus is made by melting lard 1000 parts with 

 benzoin 20 parts. The melting is accomplished by means of a water- 

 bath. The temperature -should not rise above 60° C, and should be 

 continued for two hours. After straining, the mixture should be 

 stirred until cool. 



It is used as a base for ointments. The benzoin acts as a preser- 

 vative to prevent the lard from becoming rancid. 



What is (a) a hypnotic, (b) a mydriatic, (c) a myotic? Give an ex- 

 ample of each. 



(a) An agent which produces sleep, without first causing excite- 

 ment; e.g., potassium bromide. 



(b) An agent which causes abnormal dilatation of the pupil; 

 e.g., atropia. 



(c) An agent causing abnormal contraction of the pupil; e.g., 

 opium. 



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