546 
REVIEWS. 
to refer to the conifers of Australia, when true pines do. not occur in 
that region. In several places, as on pages 296, 331, 377, 427, the term 
cells is used where bordered pits are meant. The illustrations are, in the 
main, very good. ■■.Natural color photography has been used in the 
reproduction of some of the micro-sections. Unfortunately, some of the 
sections, were too thick to make it possible to show much of detail in 
their reproduction. F. W. F. 
In addition to tlie botanical features of the book reviewed in the above 
paragraphs, there are -many things which will arouse the interest of an 
organic chemist. The advantages accruing from the cooperation of 
botanist and chemist are well shown in the systematic method of treat- 
ment and the arrangement of the subject-matter. 
The work on essential oils contains many noteworthy results, a few of 
which may be cited. The optical rotation of the'terpenes of the oils from 
the leaves of some species of Callitris is in the opposite direction to that 
obtained from the fruits, even if collected from the same tree; some of 
the leaf oils contain a high per cent of geranyl acetate; guaiol occurs in 
the wood of most of the species of Callitris. A new phenol, named by 
the author, callitrol, has been isolated. Limonene is found in the majority 
of the species’ of the same genus associated with geraniol and geranyl 
acetate. Athrotaxis sdaginoides Don yields limonene having the rota- 
tion [a] D -j- 112.2° : the oil distilled from Dacrydium franklinii Hook, 
f. contains a new terpene which the authors have termed dacrydene; 
methyl eugenol occurs to the extent of about 86 per cent in the oil dis- 
tilled from the wood of Dacrydium franklinii Hook. f. A new diterpene 
was isolated from the oil yielded by Pliyllocladus rhomboidalis Rich. ' 
The large amount of material which the authors have examined is 
probably responsible for the fact that the experimental work appears to 
have been curtailed to the extent that serious doubts arise in the mind 
of the reader as to whether or not some of the compounds described were 
identified with sufficient exactness. More precise quantitative data would 
add considerable value to the book from the standpoint of a chemist, and 
it is probable that anyone interested in the commercial phases of ' the 
work would make the same criticism. For instance, it is suggested that 
Agatliis robusta C. Moore may be a commercial source of turpentine, yet 
the average yield of oleo-resin per tree, the rate of flow of the resin, or 
the relative abundance of these trees in any given district is not stated. 
B. T. B. 
