MEDICINES AND THEIR CLASSES. 37 



cury biniodide ointment; also cantharides, mustard and 

 other active blisters, when repeatedly applied to the same 

 spot. 



Tonics impart strength. Sulphuric acid, nitric acid, 

 iron, iron and copper sulphates, arsenic, cinchona, quinine, 

 quassia, cocaine, cod-liver oil, gentian, silver nitrate, zinc 

 oxide, buchu, &c. Heart Tonics — digitalis and its alka- 

 loids, casca (doom) and its active principle, erythrophlcein, 

 strophanthus hispid us, squill, caffeine, nux vomica, and 

 strychnine. 



Vermicides. — See ' Anthelmintics/ 



Vermifuges. — See ' Anthelmintics/ 



Vesicants.— See ' Blisters/ 



