450 R. ROBINSON AND H. G. SMITH. 
also contains abundance of phellandrene. Another group 
free from eudesmin comprises most of the pinene yielding 
species, which are, however, usually distinguished from the 
phellandrene group by the fact that their kinos contain 
aromadendrin. On the other hand eudesmin has been 
observed in many of the kinos of the cineol-pinene oil bear- 
ing species and probably occurs in all of them, but always 
in association with aromadendrin. 
Probably not more than one-third of the known species 
of Eucalyptus growing in Hastern Australia have kinos 
which contain eudesmin, and in only a few of these does it 
occur in great amount. It is found in greatest abundance 
in the typical ‘ Boxes,’ and the species employed for the 
preparation of the substance for the present research has 
been Eucalyptus hemiphloia which grows plentifully in the 
immediate neighbourhood of Sydney, and exudes a large 
amount of kino (sometimes in pieces the size of a hen’s egg) 
which contains about 10 per cent. of eudesmin. The tannins 
of the group of kinos which contain eudesmin are catechol 
tannins, and eudesmin itself is a catechol derivative, whilst, 
on the other hand, the tannins of kinos not containing 
eudesmin are resorcinol or phloroglucin derivatives, and 
coupling together the above observations it appears that 
production of phellandrene in the oil is connected with 
production of metahydroxy phenols in the kino, whilst the 
cineol-pinene combination is associated with the production 
of catechol derivatives. On the very probable assumption 
that most of the constituents of plants are condensation, 
reduction, or oxidation products of carbohydrates, it may 
be stated with some confidence that the connection between 
the nature of the oil and the nature of the kino indicates 
some deep seated particular mode of condensation of the 
carbohydrate at an early stage, and, indeed, it is easy to 
see how stereochemical differences in aldohexoses could 
