VAMI.l.A AKt )M.\ i n .\. 



93 



The saj) presents the aj)(x:ar.ince of a whiit-, milky, oi^ujue litjuitl, 

 and in its normal slate contains a particular su^ar, albumen, and 

 Coniferinc. In order to prevent fernu-ntalion it ouv^ht, after live or 

 six hours at the most, to be boiled in a furnace from ten to fifteen 

 minutes, so as to conj^eal the albumen it contains. The boilinj^ 

 li(iuid is hllcreil through a coarse flannel or baize baj^, and the 

 filtered product is then e\ aj)orateil to the (jne-fifth part of the orij^inal 

 quantity. It is then allowed to cool gently in a shady place for 

 one night, when it deposits very small white crystals of X'anilline. 

 In order to collect them the li(iuiil is thrown u|>on a linen cloth, 

 and when the crystals are sufficiently drained they are pressei! in 

 order to squeeze out thi- brown syrup which colours them and 

 prevents them from drying. 



The X'anilline obtained by this method is identical with the 

 crystals already described as forming on the Vanilla jxkI, the 

 chemical constitution of the one being identical with that of the 

 others, as is also their physical jiroptrties. 





"T — T" 



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