THE TECHNOLOGIST. [Sept. 1, 1864. 



74 ON THE PHYSICAL SCIENCES WHICH FORM 



Sydney made articles are fast driving the American out of the market 

 in the other colonies, as they can be produced much cheaper than 

 foreign goods can be importel, and are very superior in finish and general 

 quality. 



Tt is somewhat surprising to know that, notwithstanding the enormous 

 quantity of goods manufactured, and with all the facilities at their com- 

 mand, Messrs. Moon and Co. are unable to supply orders fast enough. 

 The demand is always in advance of their powers of production, 

 although new adaptations of machinery are constantly offering greater 

 facilities for the supply of the goods which they manufacture. 



We may mention, in order to show the facilities afforded by ma- 

 chinery, that a boy can mortice 100 four-panel doors daily, at a cost for 

 wages of 3s. 4d., and that this work, if performed by hand-labour, would 

 cost about 101. That is, perhaps, an extreme instance, but the difference 

 in the cost of making mouldings, &c, if not quite so great, is sufficiently 

 remarkable. Most persons not acquainted with the facts are under the 

 impression, when seeing packages of doors and sashes being taken into 

 the interior from Sydney, that they are imported American goods. This 

 used to be the case, but it is not so at present. We are assured that very 

 few sashes and doors have been imported during the last two years, and 

 that they cannot now be introduced for less than about 50 per cent, over 

 the Sydney manufacturers' prices. 



ON THE PHYSICAL SCIENCES WHICH FORM THE BASIS OF 

 TECHNOLOGY. 



BY THE LATE GEORGE WILSON, M.D., F.R.S.E. 

 REGIUS PROFESSOR OF TECHNOLOGY, UNIVERSITY OF EDINBURGH. 



(Continued from page 14.) 

 There are thus four means of inducing chemical change, resembling 

 familiar arithmetical processes. The first, a process of simple subtrac- 

 tion ; the second, a process of simple addition ; the third, a process 

 where certain figures are annexed and others removed ; the fourth, a 

 process where, without altering the total number of figures, the value 

 of each and of the sum total is changed, by changing their relative 

 decimal places. 



Astronomy and Chemistry thus stand at opposite poles ; although no 

 one who studies both can fail to perceive that the stars of the one 

 science are represented by the atoms of the other, and that it is felt to 

 be as natural to speak of the atmosphere of an atom as of the atmo- 

 sphere of a star. The ancient vague alliance between astrology and 

 alchemy has not been repealed, but only by wise restriction and 



