216 AUSTRALIAN NATIVE PLANTS. 
solution, exhibiting a strong blue fluorescence. If the gum is 
steeped in water for some time the solution becomes very dark in 
colour. Alum, followed by carbonate of soda, throws down 
apparently some of the brown colouring matter without interfering 
with the fluorescence, as after precipitation the solution, although 
lighter in colour, is very strongly fluorescent. A solution purified 
by alum in this way has its fluorescence immediately destroyed by 
acids, and restored again by alkalies. Examining its absorption 
spectrum it is found that while fluorescent, the solution gives a 
broad absorption band at the violet end of the spectrum extending 
to about G; this band disappears on destroying the fluorescence 
by acids, but re-appears on the addition of alkalies. The solution 
of the gum does not appear to rotate polarized light. The gum 
itself communicates only a very faint fluorescence to rectified 
spirit. I do not know whether this gum is applied to any indus- 
trial or medicinal use, but as it is collected by the natives of India 
it is probable that it is supposed by them to have some medicinal 
virtues. (Dymock, Materia Medica of Western India.) 
Queensland. 
23. Cedrela Toona, Roxd., (Syn. C. australis, F.v.M.); N.O., 
Meliacez, B.FI., i., 387. 
“ Red Cedar.’’ (For other names, see ‘‘ Timbers.’’) 
This tree yields a perfectly transparent pale amber-coloured 
gum in small quantity. 
New South Wales and Queensland. 
24. Erythrina indica, Zam., N.O., Leguminosz, B.F1., ii., 253. 
“Indian Coral” Tree. 
This tree yields a brown gum of no value. It is not endemic 
in Australia. 
Queensland and Northern Australia. 
25. Flindersia maculosa, 7.v.J2., (Syn. F. Strzeleckiana, F.v.M. ; 
Sirzelechya dissosperma, F.v.M.; Ele@odendron maculosum, 
F.v.M.); N.O., Meliacez, B.FI., i, 388. 2. S/rzeleckzana in 
Muell. Cens., p. 9. 
“Spotted, or Leopard Tree.” 
