944 M. B. WELCH. 
a much darker reddish-brown extract than either of the 
other two. KH. saligna gave a yellowish to yellow-brown 
extract, whilst that from EH. marginata was practically 
colourless. With ferric chloride E. resinifera gave a 
greenish colouration, H. saligna blue and E. marginata 
only a very slight indication. Caustic potash gave a pink 
colour with H. resinifera, more reddish-brown in the case 
of E. saligna, and a yellowish tint with E. marginata. 
Lime water also gave a pink with H. resinifera, more brown 
in the case of E. saligna and no alteration with E. mar- 
ginata. Otherred timbered Hucalypts with a comparatively 
open grain, such as Bangalay, EH. botryoides;; Swamp 
Mahogany, H. robusta; Flooded Gun, H. saligna var. pallidi- 
valvis; were also examined, but no very conclusive results 
were obtained. Specimens of HE. robusta and E. botryoides 
were found to be somewhat variable in the behaviour of the 
extracts, and although some samples of H. robusta were 
almost identical with H. botryoides, in other cases the 
results were dissimilar, | 
Among the closer grained red-coloured Hucalypts, e.g., 
HK. tereticornis, Red Gum; EH. crebra, Narrow Leaved Iron- 
bark; E. punctata, Grey Gum; EH. rostrata, Murray Red 
Gum; EH. tereticornis was found to be exceptionally vari- 
able. With ferric chloride the colour of the extract ranged 
from deep blue to almost colourless. In comparing the 
two ‘Red Gums’ E. rostrata and E. tereticornis it was 
found difficult to separate them with certainty, though H. 
rostrata gave more uniform results and lighter colourations 
than the exceptionally dark E. tereticornis. In the speci- 
mens examined EH. rostrata gave fairly close results to 
those obtained for E.crebra. Other timbers tested such as 
E. Dawsoni, Slaty Gum; EH. polyanthemos, Red Box; E. 
longifolia, Woollybutt; and E. propinqua, Small Fruited 
Grey Gum; did not give conclusive results. Specimens of 
