142 ODOROGRAPHIA. 
~ 
gallol and malic acid with sulphuric acid. It crystallizes from 
hot water in yellowish needles or prisms which melt at 255°-256° 
and smell like coumarin on heating. | 
Methylumbelliferon is formed when umbelliferon is heated with 
methyl iodide, caustic potash, and wood-spirit. It crystallizes in 
plates which have a strong odour of coumarin when heated, and 
melts at 114°*. Its boiling aqueous solution emits the same 
odour, 
* Tiemann and Reimer. 
