104 POISONOUS PROTEINS 



can be approximated. Kahlbaum's alcohol, as 

 we have found, often shows appreciable traces 

 of amylic alcohol by this test. 



13. To 10 c.c. of the alcohol add ten drops of 

 colorless analin, then three drops of hydro- 

 chloric acid. No coloration should develop 

 within five minutes. This is a test for furfurol, 

 which we have not found in either domestic or 

 imported alcohols. 



14. Evaporate 100 c.c. of the alcohol to dry 

 ness, extract the residue with from 3 c.c. to 5 

 c.c. of salt solution and inject this intravenous- 

 ly into a guinea-pig of from 200 g. to 300 g. 

 weight. With our redistilled alcohol there is no 

 effect, while with Kahlbaum's the animal is 

 often thrown into convulsions which may ter- 

 minate fatally. What this residue contains, I 

 have not been able to determine. It is granular 

 and sometimes contains a few needle shaped 

 crystals. 



From my experience, I have found it better 

 to use alcohol prepared in my own laboratory 

 from the commercial ninety-five per cent 

 article, by redistillation with caustic lime, than 

 to depend upon the imported product. 



