On Colonial Timber Trees. 47 



Art. XVI. — On the Ventilation of Ships. By William 

 Walker, Esq. 



[Read on 24th October, 1870.] 

 In this paper it was proposed to fix eight-inch galvanised 

 iron pipes fore and aft under the upper deck, and on each side 

 of the central portion. These pipes to be freely pierced with 

 slot holes, six by one and a-half inches in size, and to 

 terminate in the , ship's galley and aft deck galley furnaces, 

 to secure a strong upcast draft, with modifications according 

 to circumstances. 



Art. XVII. — A Proposition for the Improvement and 

 Extension of the Wharfage Accommodation on the 

 Yarra River. By M. Adolphe Carandal, C.E. 

 France. 



[Read 14tli November, 1870.] 

 The proposition embodied in this paper was, that em- 

 bankments and wharves should be constructed on both sides 

 of the Kiver upon the monolith plan, by a combination of 

 M. Coignet's system of '' Beton Agglomerds," with a process 

 patented in Melbourne by the author, for the manufacture 

 of brick and artificial stone from any kind of soil containing 

 a little clay. The earth excavated was proposed to be used 

 as the principal ingredient in the bricks to be used, as well 

 as in the beton, which it was stated would be in solidity 

 and durability second only to good granite or bluestone. 

 The great rapidity with which the material could be prepared 

 and used was one strong ground of recommendation. 



Art. XVIII. — Paper upon Colonial Timber Trees, and some 

 European Trees, %vhich have been proved to be suitable 

 to the Colony of Victoria. By F. C. Christy, Esq. 



[Read 4th October, 1870.] 



I have ventured to write a short paper upon some 

 of the useful timber trees indigenous to this colony, and 

 have added a few remarks relative to some European trees 

 which have come under my notice as being particularly 

 adapted to this climate. 



As the object of this paper is to supply information of a 

 practical rather than of a scientific character, I shall confine 



