283 



I published the above note in Journ. Roy. Soc. N.8.W., liii, 21, (1919), as I thought 

 Mr. Weston's experiments should be put on official record. An illustration will be 

 furnished in due course. 



Here, I think, is the key to the most perfect case of fusion or adhesion I have 

 ever seen in my life, viz., that brought under my notice by Mr. C'happelow of a Wliite 

 Gum and a Stringybark illustrated (as regards a section of the timber) in my paper, 

 Journ. Roy. Soc. N.S.W., xxxviii, 36 (1904). See also my " Forest Flora of Xew >South 

 Wales," vi, 79. It seems to me much more likely that so complete a fusion of two species 

 would take place at a very early stage of the existence of the two plants than by the 

 rubbing together of woody stems or branches later on. As Eucah-ptus trees are 

 increasingly grown artificially in Austraha, we may expect to see more of these grafts 

 originating in the potting shed. Perfect natiual grafts of the C'happelow t}'pe are 

 exceedingly rare, and it seems to me that my theory of fusion as young seedlings by 

 the trampling of native animals or of stock is worthy of consideration. 



K.— Fasciation. 



Fasciation of branches is not common in Eucah-ptus, or at all events it must be 

 rare, for I have not come across a record. A case of fasciation in young suckers 

 of E. gracilis was sent to me from Lake View, Griffith, Line 61 (X.S.W.) by Mr. W. D. 

 Campbell, L.S., in 1918. 



L. — Tumours and Galls. 



The literature on this subject, as regards Eucal}'ptus, is very scant. Not only 

 the most important paper but almost the only one, is "'■' On certain shoot-bearing 

 Tumours of Eucalyptus and Angophoras, and their modifying influence on the growth 

 habit of the plants," by J. J. Fletcher and C. T. Musson, in Proc. Linn. Soc. X.S.W. , 

 xliii, 191, with many plates. 



They quote Clayton 0. Smith, "' Fmther Proof of the cause and infectiousness 

 of Crown Gall '' (Univ. California Publications, Agric. Experim. Station Bull. Xo. 235, 

 December, 1912), as the first to draw attention to the fact that the stem-nodides in 

 a certain species of Eucalj'ptus are axillary, and that certain stem-nodules arise from 

 infection by soU-bacteria. "" In Eucah^tus seedlings the natural knots often appear 

 opposite each other where the cotyledons have previously attached, also the Quince 

 knots appear first at the node about the old leaf-scar. All the evidence we have goes 

 to show that some injury or weakness is necessary for infection to take place. 



Clayton 0. Smith, op. cit., p. 549, pubhshed the figure (21) which will be duly 

 reproduced. The legend is '"' Artificially caused galls on forest Eed Giuu (Eucalyptus 

 tereticornis). Crown gall has not been known to attack the various species of Eucalyptus 



