TIMBERS. 485 
thoroughly perforated by the sea-worm.” (Port Darwin corres- 
pondent of Tropical Agriculturalist, Sept., 1885.) 
However, in regard to*the timber which formed the subject 
of the following report, it is not possible that any mistake such as 
hinted at in the previous case could have been made. 
In the year 1876 there was presented a “Report from the 
Engineer of the Auckland Harbour Board upon experiments 
he has made with Jarrah, to see whether it is really proof against 
the attacks of the Teredo (mollusc) which inhabit Auckland 
waters.” I make the following extracts from the report (which is by 
Mr. D. E. Macdonald, A.M.I.C.E.) :— 
“On the 3rd July, 1874, I obtained two squared logs of 
Jarrah timber from Messrs. Danaher and Lanigan, contractors for 
the Mangere bridge. This structure spans the Manukau, and is 
erected on Jarrah piles specially selected by Mr. Danaher, who 
visited Western Australia for that purpose. One of these logs I 
had sawn into pieces of scantling, 6 x 3, and spiked to the totara | 
piles of the Queen-street wharf. A few days since I had two of 
these pieces taken up, and found that although they had only been 
in the water for twenty-one months, the teredines were carrying on 
their destructive operations. (Specimens submitted, Nos. 1 and 2.) 
- I made an examination of the Jarrah used in the Mangere Bridge, 
and regret having to state that the piles and lower headstocks have 
been attacked by the teredo in the most determined manner, and 
from their large growth fear that it will be found necessary ere 
long to replace the whole of the piles. (Specimens No. A, B, C, 
were taken from No. 1, g, and 19g row or bay of piles. Specimen 
D was taken from a Jarrah g x 3 plank, found on the mud on the 
upper side of the bridge.) It is about two years since these piles 
were driven.” 
On July 6th, 1880, Mr. Macdonald reports :—‘‘ With my 
report under date 29th March, 1876, I submitted specimens No. 
A, B, and C, of Jarrah timber taken from the piles of the Mangere 
Bridge, and stated ‘that it will be found necessary ere long to 
replace the whole of the piles.’ I have now to state that a contract 
has been let by the General Government for replacing the whole 
of the Jarrah piles with Totara.’’ With this report Mr. Macdonald 
