380 H. G. SMITH. 
for grinding the leaves ; the best form of cheap mill will no doubt 
be forthcoming. Iron utensils for the extraction must not be used. 
Although in this industry as in may others, superior advantages 
are to be gained by carrying out the extraction on a large scale, 
yet, there is no reason why it should not be done in a small way 
“also. Mpyrticolorin when dried is not liable to change, so that it 
is an ideal material for collection and export. The quantity of 
this class of dyestuffs used annually must be very great, although 
I have been unable to obtain definite information on that point, 
but in the Board of Trade Journal for 1894, page 474, it is stated 
that the export of fustic alone from Mexico, known in that country 
as ‘‘palo-moral” or “ palo-amarillo,” reaches 9,000,000 kilogrammes 
a year. This is exported to England, France, and Germany. 
It is not to be expected that HZ. macrorhyncha is the only 
Eucalypt containing myrticolorin in payable quantities in the 
leaves, and it would be well to bear this substance in mind in 
future experiments with eucalyptus leaves. It appears necessary 
for the formation of myrticolorin in the leaves that they be care 
fully dried, no heating or fermentation being allowed. A few 
pounds of myrticolorin will now be obtained and forwarded to 
England for experiment. My thanks are due to my colleague at 
this Museum, Mr. R. T. Baker, for botanical assistance in the 
determination of the species. 
