Annual Report. 379 



horizontal edges are exposed on all sides, the general arrange- 

 ments are therefore, incompatible with existence of artesian 

 wells, properly so called. But where frreat masses of diluvial 

 matters are heaped upon the flanks of mountains as on the 

 eastern slope of The Table Mountain, borings through these ma- 

 terials will generally produce water. It has been,found in that 

 country at depths varying from 20 to 100 feet; in the latter 

 case the fundamental slate rock appears to have been reached, 

 and the water is represented as fine and copious. Round the 

 base of the mountain there issue forth five or six very plenaful 

 springs, of which the greatest at Newlands emits, at present, 

 when all issues are contracted by the effect of the past summer, 

 a supply of 850,000 gallons per day. It is now proposed to 

 convey part of this spring to town. The distance is 27,000 

 feet. 



Tide Guages, for ascertaining the periods and rate of pro- 

 gress of the tides, have been erected, under the superinten- 

 dence of the Astronomer Royal, at Simon's Bay and the Cape 

 Town Jetty ; and some notices of the observations have been 

 communicated to the Sub-Committee for Meteorology, and will 

 find a place in their Report. 



The President communicated a paper on this subject, by 

 Professor Wiiewell, in which the advantages to be derived 

 from such observations, at this place, are clearly indicated. 



The object in general is, to trace the connexion between the 

 Vast tide waves of the two oceans which our peninsula separates, 

 60 as to elucidate how that of the Atlantic is modified or 

 i'einforced by the undulation transmitted round the Cape of 

 Good Hope, from the eastward. 



Perhaps the machines, whose office it is to afford the requisite 

 information, may be made to register the changes they indicate, 

 according to methods which have been adopted elsewhere, and 

 which have been illustrated in the proceedings of the Institution, 

 as applicable to the thermometer and barometer. A siniHar 

 method will be found described in a paper in the New Edinburgh 

 Philosophical Journal, No. 30, by Mr. Aitiieston, in which 

 the indications are received on a revolving face or dial. It may 

 however be more convenient to receive these indications on sheets 

 resting on the convexity of a revolvinof cylinder, as these will 

 afford more convenient comparisons, and may be so combined 

 as to form a minute, regular, and continued map of all the 

 occurring incidents as to meteorology. The Council has this 

 day been enabled to present a second Report from the Meteoro- 

 logical Committee, to which it refers for information of the 

 Proceedings of the Institution, in regard to this branch of its 

 in((uiries. 



The Council has still to recommend that means be taken to 



