Jeffrey. — The Wound Reactions of Br achy phy llum. 3 87 
found abundantly in isolated fragments of wood possessing the characters 
of that present in leafy and determinable branches of Br achy phy llum, in 
this instance occur in the wood of an authentic branch itself. The diagnosis 
is thus placed beyond any reasonable doubt, since it is extremely improbable 
that two different extinct genera of Araucarineous remains should present 
this very remarkable traumatic reaction. 
It becomes necessary at this stage to compare the traumatic reactions 
of the living genera of the Araucarineae with those of the extinct Mesozoic 
genus Br achy phy limn. Photograph 13, Plate XXVIII, shows a portion of the 
edge of a healed wound in Agathis alba , material of which was very kindly 
sent by the Director of the Botanic Gardens at Buitenzorg, Java. It will 
be seen from the photograph, that although there is a considerable amount 
of callus formed on the margin of the wound, there is no indication 
whatever of the presence of traumatic resin-canals such as invariably 
appear in connexion with healed wounds in Br achy phy limn, so far as 
has been observed. Through the great kindness of Dr. Treub, Director 
of the Botanic Garden at Buitenzorg, Dr. Maiden, Director of the Botanic 
Garden at Sydney, N.S.W., Dr. L. Cockayne, of Christchurch, New Zealand, 
and Professor G. L. Goodale, Director of the Botanic Garden of this Uni- 
versity, the writer has had the opportunity of examining the traumatic 
reactions of a considerable number of species of Agathis and Araucaria 
of wide geographical distribution. In all the cases yet studied, the con- 
ditions resulting from wounds are substantially the same as those shown in 
photograph 13. It is not proposed to discuss this matter farther at the 
present time, as it will be sufficiently considered in a future memoir on 
the living Araucarineae. One feature of healing wounds in the existing 
Araucarineae is, however, worthy of present notice, viz. the fact that there is 
an abundant formation of mucilage in connexion with the wound, similar 
to that found normally with the resin, in their cortical resin-canals. This 
mucilage generally penetrates into the adjacent tracheids, especially in 
wounded roots. 
Among the lignites gathered at Kreischerville, Staten Island, on 
several occasions in company with Dr. Arthur Hollick of the New York 
Botanical Garden, the writer found some specially well preserved ones 
in the Drummond pit, still coated with their inner bark. These lignites 
showed all the features of wood structure, which are found in the living 
Agathis and Araucaria, and differed as a consequence markedly from the 
Araucarian lignites found most abundantly in the adjoining Androvette 
pit, from which the major part of the material of Brachyphyllum has been 
derived. Fortunately the material from the Drummond pit showed 
numerous healed wounds, not only in the deeper layers of the stem, but 
also on the surface as well. The outside of the specimens was, in fact, 
in some cases marked by numerous cicatrices, representing healed wounds 
D d 
