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timbers to the extent of about one pound to 2,000 pounds 
of anhydrous wood. ‘Taking the percentage result of 
mineral substances as determined in the ash of HE. regnans 
as fairly representative, it will be seen, from the figures 
tabulated further on, that the amount of lime (CaO) in the 
timbers of these big trees would only be about one 15,000th 
part of the weight of the timber when calculated free from 
moisture. Although the amount of magnesia (MgO) is 
somewhat greater, yet, even this constituent only repre- 
sents about one 10,000th part of the weight of the anhydrous 
wood. 
It has been stated previously that manganese is a con- 
stant constituent in the Hucalypts generally, and it thus 
appears to be essential to the growth of these trees. The 
amount of manganese in the ash of the timber of EH. regnans 
was only 0°274 per cent.,sothat this element only represents 
one part in 676,000 parts of the anhydrous wood. The leaves 
of E. regnans, however, gave 2°85 per cent. of ash, this 
being in agreement with the amount obtained with the 
leaves of allied species. 
A Eucalyptus which often grows to a very large size in 
Eastern Australia is the ‘‘Blackbutt’’ E. pilularis. One 
of the local sights at Bulli in New South Wales is the big 
tree of this species which is growing near that place. It 
has a circumference of 59 feet, and is about 280 feet high. 
It is not difficult to suggest the distribution of mineral 
constituents in this tree also, as considerable data have been 
obtained from the timbers, as well as other portions of 
representative trees of this species. This material was 
collected from trees growing at the following widely dis- 
tributed localities, Ashfield, Thirlmere, Ulladulla, North 
Coast New South Wales, and Marrickville (two specimens). 
This species has been chosen for more extended investiga- 
tion because it is a good representative Eucalypt in New 
