20 Be v. 0. Fisher on Variations of Gravity and their 



about 800 feet high, whereas the parallelepiped has been taken 

 as rising from the sea-level. This would make its attraction 

 too great. The difference could 



be calculated, if worth while. 



Further, the slope of the range ought to have been taken into 

 account. Thus a close agreement is not to be expected. 

 However, referring to the fifth column of the Table, it appears 

 that local attraction at More relative toPunnae ought to produce 

 2*26 swings per diem ; whereas the attraction of our parallele- 

 piped at a station situate as supposed would produce 4*15, or 

 nearly two swings more. The visible masses were estimated 

 as. being capable of producing 23*57 swings. Hence the 

 hypothesis of the parallelepiped, Irydrostatically supported, 

 accounts for 19*42 out of the 21*31 swings in defect which 



