— 97 — 
gave the sylvestrene-reaction (blue coloration of a drop of oil on 
adding glacial acetic acid and concentrated sulphuric acid), — although 
with a violet hue. The authors suspect in this terpene Baeyer's 
carvestrene, and attribute the differences which still exist between these 
two bodies, to deficient purity of the preparation obtained by Baeyer. 
On the strength of their observations Kondakow and Schindel- 
meiser draw up for this hydrocarbon various formulae of a meta- 
menthadiene, and refer to the newly - discovered relation between 
fenchone and metacymol derivatives. The formation of dihalogen com- 
pounds with halogen to the tertiary carbon atom, brings the authors 
back to the presence of a tertiary isofenchyl alcohol, from which as 
crude material they hope to obtain a higher yield of the carvestrene- 
like terpene. 
Ketones. 
Camphor. There has recently appeared from the pen of the 
Helsingfors Professor Ossian Aschan, a monographic representation 
of the theoretical results of the camphor-research i). It gives a concise 
but excellent historical review of the fundamental work in this domain, 
so closely allied to the terpene chemistry, — work, which in the course 
of time has led to more than 30 different camphor formulae. On the 
strength of the facts resulting from this work, all the formulae are 
criticised, from which criticism issues as the sole expression which meets 
all requirements and observations, Bredt's formula which has been 
universally recognised as correct. Of the derivatives closely related to 
camphor, the author discusses camphene and bornylene and their respec- 
tive constitutions, wiiich since Wagner's work have gained renewed 
interest for the camphor-research of the last few years. 
Methyl cy clohexanone. Contrary to the work done by Bouveault 
and Tetry^) and by Speranskiy), who in the oxidation of cyclic 
ketones, such as menthone, pulegone, and ^-methyl hexanone, obtained 
exclusively j8- methyl adipic acid, Markownikoff^) established the 
occurrence of a-methyl adipic acid in addition to the /3-modification ; 
both isomers occur in equal quantities. Markownikoff attributes the 
negative results of Bouveault and Tetry to the fact that they in- 
correctly judge the different degrees of so ubility of dianilides of the 
^) The constitution of camphor and its most important derivatives. Brunswick 1903. 
Fr. Vieweg & Sohn, publishers. 
-) Bull. Soc. chim. III. 25 (1901), 441. Report October 1901, 66. 
^) Journ. russ. phys.-chem. Ges. 34 (1902), 10. Report October 1902, 97. 
^) Journ. russ. phys.-chem. Ges. 35 (1903), 381; Chem. Centralbl. 1903, II. 289. 
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