Meteorological Observations. 149 



most cases add greatly to the value of the communications, as it will be quite 

 impracticable for the Committee, should observations flow in in masses, unre 

 duced or erroneously reduced, to undertake the overwhelming task of recom. 

 puting them. 



Although not, strictly sj)eaking, a branch of meteorology, yet as the col- 

 lection of observations of the Tides has been made a part of the duties of your 

 Committee, they propose the following stations as points where it would be 

 esj)ecially desirable to obtain regular observations of the time and height of 

 high and low water, according to the rules and on the plan proposed by 

 Mr Whewell, in his late researches on this subject, and they earnestly invite 

 communications on this head from any residents at those ports who may have 

 leisure and take interest enough in the important questions connected with 

 the subject. 



Cape Town, Ascension, 



Simon's Bay, Mauritius, 



Port Elizabetli, Tristan d'Acunha, 



Knysna, Madagascar, 



Saldanha Bay, Mozambique. 



In Cape Town and Simon's Bay, they have the pleasure to report, that a 

 series of observations under the superintendence of Captain Bance and Mr 

 Levien have already been undertaken at the instance of the Astronomer-Royal, 

 and are now in active progress. 



Oti a Method of Drilling, Turning, and Working Glass, by 

 means of Turpentine. By Mr John A die.* 



68 Prince's Street, Edinburgh, 

 Dear Sir, mh February 1836. 



Agreeably to your request, I shall here state the method 

 of drilling or turning glass, which I had the honour of com- 

 municating to the Society of Arts last Session. 



It consists simply in using oil of turpentine with the com- 

 mon drill, file, or turning tool ; and if care be taken that the 

 cutting edge is never dry, it will not soon blunt, and the glass 

 will be worked with great expedition. 



I learned this curious fact when in London last spring, and 

 that it was by accident discovered by a Frenchman. I am, 

 dear Sir, yours, &c. (Signed) John Adie. 



To the Secretary of the 

 Society of Arts for Scotland. 



• Read before the Society of Arts for Scotland, 11 th March 1833. 



