PHYSICAL ann LITERARY. 33 
“ fwimming body is equal in weight to a 
‘ quantity of the fluid whofe bulk is equal 
“to that of the part immerfed:’’ For, to 
comprehend this, as well as all ordinary 
cafes, it fhould be faid more generally, 
That “ the whole weight of the fwim- 
** ming body is equal to the weight of the 
“ quantity of the fluid difplaced by it.” 
(22. THEsE Phenomena appeared to me 
worthy of obfervation here, both becaufe 
they fhew the fertility of optical principles 
in leading to the knowledge of things o- 
therways inacceflible, and becaufe they 
exhibit a clear fpecimen of a repulfive 
power, fimilar to that which we fuppofe 
_neceffary for the reflexion of light from 
the anterior furface of a denfer medium, 
Nor do I fee how it is poffible to account 
- for the fufpenfion of the drop in the air 
by comparative attractions; into which 
_ fome other appearances of repulfion have 
F been, perhaps, not unfuccefsfully,. refol- 
_ved*, 
 Vou.I. EB Sik CT, 
. * See Jurin on capillary attra@ion, at the end of 
- Cotes’ hydroftatical le@ures. 
