88 ANNUAL RECORD OF SCIENCE AND INDUSTRY. 



oxidizing bodies, such as burning coals, it will be immediate- 

 ly indicated. Numerous plants are mentioned, besides gar- 

 lic, as possessing this same odor. 2. The odor of burning an- 

 timony. This, according to most authors, is to be compared 

 to nitric acid. 3. The tin odor. This is perceived when tin 

 is rubbed with the naked hand. It is generally known as 

 the metallic odor. 4. The odor of the radish. This is ex- 

 haled when selenium is oxidized by combustion, so as to form 

 selenic acid, the fiftieth part of a grain of the former being 

 sufficient to fill a room with the odor. 5. The odor of the 

 horse-radish, or mustard, found in numerous bodies. 6. Of 

 sulphur and sulphurous acid. 7. Of rotten fish, found in phos- 

 phureted hydrogen. 8. Of ozone, or that which is diffused by 

 an electric machine when set in operation. 9. Of nitrous acid. 

 10. Of chlorine and chlorinous bodies. 11. Of osmic acid. 

 12. Of bromine. 13. Of iodine. 14. Of hydrocyanic acid, or 

 bitter almond. 15. Of the acids, such as a, the purely acid ; 

 b, the pungently acid ; c, sulphurous acid ; d, nitric and ni- 

 trous acid ; and e, carbonic acid. 16. The alkaline odor, such 

 as ammonia. These are divided into a, pure ammoniacal ; 

 b, impure ammoniacal ; c, herring or fish-like (as methyla- 

 mine) ; d, the hemlock odor; e, the tobacco odor; and/", nar- 

 cotic odor. 17. The odor of tar and smoke, as in creosote, 

 carbolic acid, benzole, etc. 18. Of petroleum and mineral oils. 

 19. Of volatile oil, or aromatic oil. 20. Of the piwely ethereal 

 oils, such as the acetic, or the odor of wine, the apple, pear, 

 etc. 21. Of alcohol, pure and fusel-like. 22. The mushy 

 odor. 2(7, CXL VII, 225. 



SPONTANEOUS COMBUSTION OF CHARGED SILK. 



In consequence of the frequent occurrence of cases of spon- 

 taneous combustion in " charged silks," the German railroads 

 have refused to receive them for transportation. Charged 

 silks are goods which have been treated with grease or oil, 

 for the purpose of increasing their weight and their conse- 

 quent apparent value, this being done mainly in France and 

 Belgium. 5 C, xiii., 104. 



ANHYDROUS ALCOHOL. 



The best process for obtaining alcohol absolutely free from 

 water is said by Erlenmeyer to consist in boiling with quick- 



