ON SOME N.S.W. TAN-SUBSTANCES. 



257 



TABLE III.— BARKS. 





No. 



Species. 



Percentage 

 of Extract. 



1 



A. vestita 



50-82 



2 



A. longifolia ... 



3035 



3 



E. stellulata 



27*64 



4 



A. melanoxylon 



20-63 



5 



E. maculata 



20-865 



6 



E. Gunnii (Bombala)... 



10-84 



7 



E. Gunnii (Delegate) 



19-4 



8 



E. viminalis 



18-65 



9 



E. Stuartiana ... 



15-39 



10 



A. glaucescens ... 



14-29 



11 



E. siderophloia 



14-2 



'12 



E. corynibosa ... 



12-16 



TABLE IV.— BAEKS. 



No. 



Species. 



Percentage of 

 Tannic Acid. 



1 



A. vestita ... ... 



27-96 



2 



A. longifolia ... 



18-93 



3 



E. stellulata ... 



12-86 



4 



E. Gunnii (Bombala)... 



11-35 



5 



A. melanoxylon 



11-12 



6 



E. maculata 



9-74 



7 



E. Gunnii (Delegate)... 



9-45 



8 



A. glaucescens ... 



8-10 



9 



E. viminalis 



7-504 



10 



E. siderophloia... 



6-702 



11 



E. corynibosa 



5-85 



12 



E. Stuartiana ... 



5-25 



It will be observed that the percentage of tannic acid in the 

 Eucalyptus leaves examined, varies between 1-815 and 18-377 per- 

 cent., and in Acacia leaves between 1 '932 and 3*382 per cent., 

 with the exceptional instance of A. vestita, (15-18 per cent.), which 

 forms a notable exception to the general poverty of Acacia leaves 

 as regards tannin. It has been previously noted that Baron 

 Mueller and Mr. Rummel found between 15 and 16 percent, of 

 tannic acid in the leaves of Acacia pycnantha ; these two Acacias 

 therefore agree very closely in wealth of tanning power. But 

 Wattle (Acacia; leaves are as a rule of no value to the tanner, 

 and likewise many species of gum (Eucalyptus) leaves which, 

 although richer, are still not of much value. Yet although in 

 these researches I have scarcely crossed the threshold of the subject, 

 1 think I have shown that some leaves are worth conserving, and 

 the intelligent farmer herein should receive an additional stimulus 

 to acquire the names of the trees upon his property. The percentage 



