J00 SPRINGS. [Lesson xxx. 



time of flowing does not seem at all connected 

 with the time of the shower. But in answer to this, 

 I would observe, that it is not an easy matter to 

 judge of this, as it cannot be determined which was 

 the shower that caused the flowing of the Spring. 

 Those showers which cause the Spring to flow may 

 perhaps fall at a great distance from it j while those 

 which fall near it may have an effect upon some 

 Spring at a distance. Or there may be four or five 

 showers fall in the interval, between the flowing o 

 the Spring and that shower which caused it to flow. 



But perhaps it may be said, that this hypothesis 

 will not satisfactorily account for those Springs 

 which ebb and flow every six hours, or some such 

 short period. It will not: we must therefore have 

 recourse to the third hypothesis, and suppose that 

 Springs which ebb and flow thus regularly are sup- 

 plied by charybdes, placed in some parts of the sea 

 of such a depth as to cause their discharges to be 

 effected by the tide, and when the tide ebbs and 

 flows at periods similar to those of the Spring. 



The second hypothesis will assist us in account- 

 ing for reciprocating Springs, or those which flow 

 constantly with a stream subject to increase and de^ 

 crease. If these are supplied by condensed vapours, 

 their streams will increase or decrease in propor- 

 tion as the vapour which supplied them was pro- 

 duced in a greater or less degree by the union of 

 heat, wind, and other causes. 



As to those Springs which are constant and 

 regular in their discharge, we may suppose, that 

 they are supplied from ckaryldes) situated at such a 



depth 





