[ 558 ] • . 
be pore,' then only 4 of the fpace, which they occupy, 
is filled with matter, and the other half is to be added 
to the pore. Hence fpherules of the denfity of gold, 
arranged in the clofcfl manner poffible, iiaving their 
centers in one plane, compofe a cruft, in which, 
‘ ids, or fomewhat more than ilths, of its bulk is 
matter. Therefore, the denfity of fuch a cruft is 
fomewhat greater than i 2 times that of water, fince 
^*^th only of the bulk of water -is fuppofed to be 
matter, and i®ths is pore. 
S. Horfley. 
fThe fir ft of ihefc two Pf'ohlems^ enabled me to determine 
the greateji poftible number of fpherical particles of 
a given magnitude^ that could find room to lie at 
one time up07i the furface of the Sun ; a?td^ by the 
Jecondt I found the denfity of the crujh which 
fuch paj^ticles, in the elofeft arrimgcment prfflble^ with 
a given denfity of each particle feparateiy^ would 
eompeje. 
U. An 
