44 



Scientific Proceedings, Royal Dublin Society. 



Analysis of a Crystalline Stony Deposit in a Water-pipe, 

 Edinburgh. 



This analysis was made in my laboratory by Mr. J. B. Wise, 

 Associate of the Royal College of Science, Associate of the Institute 

 of Chemistry. 



No. 2. — This deposit is interesting and instructive, inasmuch 

 as we have accurate knowledge of the composition of the water 

 from which it was deposited, and of the length of time it took 

 to form. 



The deposit was formed in an open wooden water-trough 

 through which there must have been a considerable flow of water, 

 at Messrs. Eoe's distillery in Dublin. The water was canal water, 

 and the time of formation of the deposit was eighteen months. 

 The thickness of the deposited material is 1|- inches ; it has taken 

 an accurate impression of the grain of the wood with all the streaks 

 and knots in it. It is crystalline, and with the same colour and 

 appearance as No. 1, but the crystals may be described as 

 opaque. 



