20 2 TRANSACTIONS OF ROYAL SCOTTISH ARBORICULTURAL SOCIETY. 



gate, 23 feet; range of ordinary spring tides, 16 ft. 6 ins. The 

 gates are built of yellow pine, with greenheart sill timbers, heel 

 posts and mitre posts. They are partly cleaded ^ with i^- inch 

 thick greenheart. The yellow pine was creosoted with f of a 

 gallon of oil to each cubic foot of timber. These gates have 

 been repeatedly repaired, and all the timbers are more or 

 less perforated and decayed. The greenheart cleading has 

 been renewed at different times. 



Gates of No. 2 Dock. — Built in 1896. These gates are of 

 the same width and of construction similar to the above, but 

 with 27 feet depth of water to the sill. They are built of Kauri 

 pine, with greenheart sill timbers, heel posts and mitre posts. 

 They are cleaded with \\ inch thick greenheart. The Kauri 

 pine was creosoted with i gallon of oil to each cubic foot of 

 timber. These gates are all more or less perforated by the 

 worm, more particularly so near the edges of the timbers and 

 below the low-water level. The greenheart cleading is much 

 decayed, and part of it is about to be renewed. The actual 

 condition of the Kauri pine timbers can be better ascertained 

 while the cleading is off. 



Timber Jetty. — Constructed entirely of greenheart, erected in 

 1886, removed about 1897. Built of timbers mostly sawn square, 

 and when they were removed very few were found to be fit 

 for re-use — more especially those which were below low-water 

 level. 



Timber Jetty. — Entirely of greenheart, erected 1898. Built 

 mostly of heiun logs. Judging from a {^\s timbers which have 

 recently been removed, they have only been attacked by the 

 worm to a very slight extent when above low-water level. 

 Below low-water level they are very thickly encrusted with 

 barnacles and mussels. One pile Avhich was removed some 

 time ago showed considerable perforation when the barnacles 

 had been scraped off. 



A piece of Jarrah timber and a piece of greenheart, each 

 7 ft. by 12 ins. by 2 ins., were placed in the sea at about 

 the level of low-water of neap tides, so that they were exposed 

 at nearly every tide. They remained there for six months. 

 When they were removed, it was found that while the Jarrah 

 timber was thickly encrusted with small barnacles, no worm- 



^ I.e., covered to protect the timber below. 



