192 OUTLINES OF NATURAL PHILOSOPHY. 



of Dr JURIN, Phil Trans. N 363. art. 2. In 

 what respects the form of the upper surface, it is 

 founded on the same principles with CLAIRAUT'S ex- 

 planation, Theorie de la Figure de la Terre, tiree des 

 Principes de T Hydrostatique, 59- See also SEG- 

 NER, Comment. Soc. Reg. Gotting. torn. i. (1751,) 

 . p. 301. 



CLAIRAUT has proved, that if the law by 

 which the matter of the tube attracts the fluid, be 

 the same with that by which the parts of the 

 fluid attract one another, the fluid will rise above 

 the level whenever the intensity of the first of 

 these attractions exceeds half the intensity of the 

 second. If it is exactly the half, the surface of 

 the column within the tube will be a plane, on a 

 level with the surface without. 



Theorie, &c. 60. 



In some cases, the attraction of the bottom has an evi- 

 dent effect ; when the lower end of the capillary tube 

 is stopped by the finger, and the tube taken out of 

 the water, if the finger is withdrawn, a drop formSj 

 and the water stands higher in the tube than when 

 it was immersed in the water. LA PLACE, ibid, 

 15. This seems to arise from the action of the 

 bottom and outside of the tube on the drop, by 

 which the column of water in the tube is lifted up, 

 as it were, and raised to a higher level. 



The 



