206 R. T. BAKER AND H. G. SMITH. 



0-1474 gram gave 0*422 00 2 and 0*153 H 2 0. 



C = 78*08 ; H =. 11*54. 

 0*1422 gram gave 0*4057 00 2 and 0*147 H 2 



O = 77*81 ; H = 11*5. 

 C ]0 Hr 8 O requires C = 77*92 ; H = 11*68 per cent. 



It is known that ordinary "Cajuput" oil contains a solid 

 inactive terpineol, first isolated by Voiry in bis investiga- 

 tion of oil of cajuput. 1 The semi-annual report of Schimmel 

 and Co., April, 1901, contains a later research on terpineol 

 in which the constants for that substance isolated from 

 cajuput oil were determined. It is there shown that the 

 solid inactive terpineol of cajuput oil melts at 35 — 36° 0., 

 which is the general melting point of crystallised terpineol. 

 Dextro-rotatory solid terpineol occurs in Lovage oil (Levis- 

 bicum officinale) and the slightly laevo modification in 

 Niaouli oil (Melaleuca viridiflora). 2 A solid alcohol 

 obtained from Melaleuca oils, resembling terpineol in some 

 respects, but having a melting point 72*5° C. has not pre- 

 viously been isolated. The crystalline stearoptene occurring 

 in the oil of Melaleuca unciuata, differs, therefore, from 

 that of ordinary cajuput oil in being somewhat highly 

 dextro-rotatory, and in having a melting point as high again 

 as the solid terpineol found in ordinary cajuput oil. 



Baeyer has succeeded in preparing from tribromoterpane, 

 a solid terpineol, melting at 69 — 70°, but so far this does 

 not appear to have been found occurring naturally. If on 

 further investigation the crystalline substance isolated 

 from the oil of Melaleuca uneinata is found to be new to 

 science, as appears probable, the name TJncineol is proposed 

 for it. 



When more species of this genus shall have been investi- 

 gated, we hope to be able to demonstrate a close relation- 

 ship between the structure of the leaf and the oil con- 



1 Compt. rend., 106, p. 1538. 2 Compt. rend., 116, p. 1072. 



