[ 432 ] 
pufcle, to no more than that of an iron ball | of 
an inch diameter, moving one inch in a whole 
year. 
Again, in the diagram, p. 429, SB being the dia- 
meter of the tun, and f B, being each the half of 
one millionth of one millionth of an inch, the fpace 
contained between the fpherical furfaces f k l, e gh, 
is the maximum of the fpace that the particles of 
light with their due proportion of interface can fill, 
as they dart forth from the furface of the fun. 
For, whatever their figure be, it mud be fuch a one 
as cm be laid between thefe two fpherical lurfaccs. 
Now the quantity of matter in this fpace, mud not 
be greater, than it would be upon the hypothefis that 
each figure was fpherical, and the number of fpheri- 
cal particles the greated pofiible. Since, upon that 
hypothefis, the denfity of matter, crowded into this 
fpace, is vadly too great, to be confident with the 
appearances of nature (vide p. 425, 426.); and con- 
fequently a greater denfity would be more incon- 
fident. Therefore the maximum of the matter, and 
confequently, if the denfity of each feparate particle 
has been rightly alTumed, the maximum of the folid 
content, in each emiffion of light, is what I have made 
it ; at lead it does not exceed what I have made it, 
be the figure of the particles what it will ; and my 
conclufions (p. 424 and 425.) which red entirely 
upon the maximum of the lolid content, and that 
of the matter, and are the dronger the lefs thefe 
maxima be, will dill hold good. But if thefe 
conclufions dand, the objections moved by Dr. 
Franklin vanifh. 
The 
