I^HW REMEDIES. 203 



MEMORANDA ON NEW REMEDIES. 



Aristol (syns.— Dithymoldiodide, Annidalin) is a 

 somewhat unstable, reddish-brown, amorphous pow- 

 der, insoluble in water and glycerin, slightly soluble 

 in alcohol, very soluble in ether and in collodion. It 

 is also taken up by fatty oils and vaseline when 

 rubbed with these. It is prepared by the decomposi- 

 tion of a solution of iodine in iodide of potassium by 

 means of an alcoholic solution of thymol, and con- 

 tains about forty -six per cent, of iodine. Aristol was 

 introduced as a substitute for iodoform, over which 

 it has the advantage of being odorless. It is used in 

 the same manner and for the same purposes as iodo- 

 form. 



Formalin (formaldehyde, formic aldehyde, oxy- 

 methylene, f ormol) , an aqueous solution of formalde- 

 hyde gas (from the oxidation of methyl alcohol), con- 

 centrated to forty per cent.— CH^O^H.CO.H. A 

 clear, colorless liquid, having a peculiar pungent 

 odor, non-irritant, non-toxic, non-corrosive ; a power- 

 ful surgical and general antiseptic ; used also as a food 

 preservative (1-1,000,000 : 5,000). For hardening 

 anatomical specimens, four to ten per cent, solution ; 

 in surgery, one-fourth to one-half per cent, solution. 



Hydrogen dioxide— Hfi,— a. clear, colorless liquid, 

 resembling in every way water, but differing from 

 this in that it contains one more atom of O. Should 

 be kept in well-corked bottles and in a cool place. 

 Its strength is designated by volume— i.e., when vol- 



