128 



1914. Then follows an important paper by Dr. Cuthbert Hall, " The Evolution 

 of the Eucalypts in relation to the Cotyledons and Seedlings " (Proc. Linn. Soc, N.S.W., 

 xxxix, 473, with thirty-two plates). The paper takes cognizance of nearly 150 species, 

 and the cotyledons are attached to the seedlings, which are reproduced by photography, 

 and naturally vary in sharpness with the age of the seedlings. Each seedling (species) 

 is represented by one photograph. They are difficult to compare because the figures 

 are crowded on the plates at various angles, and some are even reversed. 



1899 onwards. My own seedling work began seriously in 1899, and has been 

 uninterruptedly continued ever since and practically all through the year. Miss 

 Flockton (from 1901 to 1919), and Miss Ethel King since that date, have made drawings 

 in colour of all cotyledons, as soon as they were unfolded, and fresh drawings of the 

 identical seedlings were made at various stages. These are in colour, and have developed 

 some surprising results. They will be reproduced in due course. 



Excellent, examples of the various types of Eucalyptus Cotyledons are depicted 

 in Part LXX, Plates 286-287. 



b. Poly- (tri-) cotyly. 



Poly- (tri-) phylly (in the juvenile leaves, of course). 



These aberrant conditions are apparently rare, and have been seldom recorded. 

 Probably they are much more frequent than at present supposed. In one case I cite, 

 tricotyly was traced to have preceded triphylly, and further inquiry may further reveal 

 a connection between the two phenomena, but it is not invariably the case. 



Dr. C. Hall has seen tricotyly in E. coriacea, E. elaiophora, E. eximia, E. Bosistoana. 

 E. pilularis, E. Stuartiana, and E. microcorys. (Proc. Linn. Soc., N.S.W., xxxix, 519, 

 1914.) 



Following are the records that have come under my notice : — 



1. E. aggregata Deane and Maiden. Triphylly. Guildford Junction, Tasmania 



(R. H. Cambage, No. 4,101). (See 5a, Plate 235.) 



2. E. calcygona Turcz. Both tricotyly and triphylly. Yellana and Butler, Eyre's 



Peninsula, South Australia (W. J. Spafford, June, 1917, No. 3.) 



3. E. cordata Labill. Cultivated plants sometimes show triphylly. (Botanic 



Gardens, Sydney, 17th September, 1919). 



4. E. cornuta Labill. Triphylly rare. (A. D. Hardy, Proc. Roy. Soc, Vict, xxviii. 



(New Ser.), p. 241.) 



5. E. corymbosa Sm. I exhibited coloured drawings of seedlings showing tricotyly. 



(Proc. Linn. Soc, N.S.W., xxxv, 523, 1910). 



6. E. eugenioides Sieb. Triphylly. Capertee, N.S.W. (J. L. Boorman, September, 



1915.) 



7. E. exvmia Schauer. Dr. C. Hall exhibited a seedling showing both tricotyly and 



triphylly. (Proc Linn. Soc, N.S.W. , xxxv, 27, 1910.) Mr. P. R. St. John 

 has sent me an excellent specimen showing tricotyly. 



