344 BOTANICAL INFORMATION. 
No. of rings. No. of rings. 
No. 1 : No. 1 idiot SE 
3 21 | 21 
3 32 3 80 
4 16 4 14 
5 13 5 14 
6 17 6 16 
7 18 7 18 
8 19 8 10 
9 17 9 16. 
95 21 10 10 
— 11 15 
m 
IT 
tole 
P: 
_ 
t2 
281 inches. 183 
— 
—— 
341 inches. 183 
The second table gives the rings upon a radius passing through a pro- 
jecting portion of the same section, the number of rings being the 
same, but the distribution of course different. : 
I had an idea that, as the Gum-trees evidently make two shoots in 
the year, one in the autumn and another in the spring, the summer 
being an apparently dead time for them as regards growth, there might 
be a growth of two rings in the course of one year; but on reference 
to the size of these trees, and the rate of increase shown by dividing 
the number of rings by the radius in inches, I do not think this sup- 
position can be correct :— 
= = 6:4 rings to an inch. M = 8'5 rings to an inch. 
In this one case the tree would increase in diameter one inch in 3:2 
years; in the other the same increase would take place in 4-2 years. 
I do not think we could assume a rate of increase double of the above, 
which we must do were there to be two rings added in each Ter 
Extracts from various Letters from Mn. James DRUMMOND, relating to 
the BorANY of Swan RIVER. 
(Continued from p. 315.) LE 
My last letter gave an account of my journey to the North, and T 
now send a few particulars of one which I have more recently made 
to the East. At the spring called Bibagoir I found a fine Mesembry- 
