pEEEBRAL EXCITANTS. Ill 



anodyne in colic, to allay irritable cough, in epilepsy 

 and chorea, in locomotor ataxia, and since it is 

 mainly excreted by the kidneys its value to relieve 

 irritability of these organs and of the bladder will be 

 apparent. 



CEREBRAL EXCITANTS. 

 Camphora— Camphok. 



Camphor is a stearopten (solid volatile oil), ob- 

 tained from Oinnamomum camphora, natural order 

 Laurinese, a native tree of Japan, China, Borneo, etc., 

 and is purified by sublimation. Found in the mar- 

 ket as white translucent masses of a tough consistence 

 and crystalline structure, readily pulverizable in the 

 presence of a little alcohol, ether, or chloroform. Its 

 specific gravity is 0.99, it sublimes without residue, 

 burns with a smoky but luminous flame, floats on 

 water, and if exposed to air slowly evaporates. It 

 has a penetrating odor and a pungent taste, is soluble 

 in 1,300 parts of water, readily soluble in alcohol, 

 ether, chloroform, fixed and volatile oils, milk, and 

 acetic acid. 



Pkbpaeations. — Camphora Pulvis, powdered 

 camphor. Dose: H., 3i.-iij.; D., gr. v.-x. 



Aqua Camphorce, camphor water, used chiefly as 

 a sedative collyrium. (Camphor 8, alcohol 16, water 

 976.) 



Spiritus Camphorce, spirit of camphor, princi- 

 pally for local use. (Camphor 10, water 20, alcohol 

 to make 100.) 



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