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VIII. 



Remarks iijion a Composition to set as a Cement tinder 

 Water; with Rejiort of Dr. Motherwell's Expe- 

 riments on the same. By His Excellency Sir 

 William T. Denison, F.K.S., &c. \_Read lOth 

 January, 1849.] 



In laying before tliis meeting the accompanying account of 

 some experiments made, according to my request, by Dr. 

 Motherwell, for the purpose of ascertaining the best pro- 

 portion of lime and clay to be employed in the manufacture 

 of a cement which might be used under water, it is not my 

 intention to enter into the question of the expense attendant 

 upon such a manufacture, but merely to make known here, 

 as generally as possible, a fact which has been estabHshed 

 by frequent experiment, both in England and France, — that 

 it is possible, by a mixture of two materials, both of which 

 are generally diffused throughout the country, to manufacture 

 an article which is fully equal to Koman cement for all 

 purposes, and which would be, in many instances, superior 

 to the cement imported into the Colony; inasmuch as this 

 is often damaged, either from damp or exposure to the air. 



The demand for cement is at present trifling, and to 

 attempt a manufactory of it now would of course only lead 

 to loss and disappointment ; but a simple apparatus might 

 be contrived which would render its production much easier 

 and cheaper than may be imagined from the accompanying 

 paper, for those who only want to procure a small quantity 

 for some special purpose : while for those who may hereafter 

 manufacture the cement for the market, a more extensive 



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