XLIV. H. D. WALSH. 
In conclusion I wish to express my very best thanks to 
Mr. W. Hi. Adams, for his very valuable assistance in col- 
lecting the particulars from which these notes have been 
prepared, and for the help he has given me in arranging 
the various samples exhibited. 
DESCRIPTION OF EXHIBITS. 
[ have laid upon the table for examination some objects 
of interest which I have collected from time to time 
during the course of my work in Sydney Harbour. These 
consist of the following items :— 
1. Two iron service bolts originally inch in diameter but 
reduced in the central portion by galvanic action to a diameter of 
about inch. These bolts were temporarily placed through 
double walings sheathed with yellow metal, and were withdrawn 
atter having been two months in the salt water. These samples 
show the most rapid action of the kind that I have ever seen. 
2. A portion of an ironbark pile and metal sheathing, already 
referred to, taken from the old Pyrmont Bridge after 48 years’ of 
service. It will be seen that the timber is perfectly sound. 
3. Tea-tree fascine from under the old Patent Slip which used 
to lie at the foot of King Street. This slip was laid in 1826, 
apparently on fascine, and I have no doubt but that this sample 
is 78 years old, having been preserved by the mud. 
4. A portion of the slip-way from the same slip. I do not know 
for certain whether this is portion of the original way, but 
presume that it must be so. The timber having been bedded in 
the mud would last a Jong time. The slip went out of use in the 
early seventies, and it is not likely that it would have been 
repaired up to that time, as there were then no divers in Sydney. 
The only means of doing submarine work being a diving bell, 
owned by the A.S.N. Company. 
5. Four sections of old piles from the demolished wharves on 
the west side of Miller’s Point. These piles were standing about 
30 years, a is from an unsheathed ironbark pile, and 4, c, and d, 
