TANS. 329 
82. Pittosporum undulatum, Ver‘, N.O., Pittosporex, B.Fl. i., 
For. 
“Native Laurel.” ‘* Mock Orange.” 
The bark yielded 1.2 percent. of tannic acid, and .7 per cent. 
of gallic acid (Mueller). 
Tasmania, Victoria, New South Wales and Queensland. 
83. Polygonum plebejum, &.2r., N.O., Polygonacez, B.FI., v. 
267. 
A species of Polygonum is used for tanning purposes in the 
United States. The author was, therefore, induced to examine 
this common Australian species of Polygonum. The whole plant, 
except the root, was taken, and 28.11 per cent. of extract obtained, 
and 11.19 per cent. of tannicacid. (Proc. R.S., N.S.W., 1887, 
200.) 
In all the colonies except Western Australia and Tasmania. 
84. Rhizophora mucronata, Zam., (Syn. &. Mangle, Roxb.; R. 
Candelaria, Wight et Arn.); N.O., Rhizophorex, B.F1., ii., 
493- 
‘* Mangrove.” 
The bark of this mangrove is used for tanning in India, 
The following is an analysis of the bark :—Tannin, 28.85 per cent. ; 
extract, 29.24 per cent. (Staiger.) 
New South Wales, Queensland and Northern Australia. 
85. Rhus rhodanthema, /.v.J/., (Syn. R. elegans, Hill); N.O., 
Anacardiacez, B.FI., i., 489. 
“Deep Yellow-wood.”’ (For other vernacular names, see ‘‘ Timbers.”) 
The author has examined the leaves and bark of this tree. 
(Proc. R.S., N.S.W., 1887.) The bark was found to contain no 
less than 23.15 per cent. of tannic acid, and 44.79 per cent. of 
extract to water. The leaves yielded 32.2 per cent. of extract, 
and 16.91 per cent. of tannic acid. This percentage is lower than 
that yielded by other species of Rhus producing the sumach of 
commerce, but as R. rhodanthema leaves will undoubtedly yield a 
light-coloured leather, they may yet come into commerce. 
New South Wales and Queensland. 
