ec roetaere, 
£. 8. Holden—Measures of the Rings of Saturn. 389 
In the last column are given those of M. Meyer, which are 
by far the most complete as to scope, and which are still in 
progress. From these it will be seen that his measures place 
the ball of Saturn eacen in the PUES, te that the 
width of the ring system alike on both 
Of course, such poenimenee need ¢ SAAR IHAROD , as the 
contrary to some of the most sonaptets series of sbalivaticee 
which we have. 
Secchi, 
Part. O. Struve, Lassell, Jacob, De la Rue, t 
1852. 1852, 1853. 1854. 1854-56 
ab seit Ae ae 
ac 2°65 Spee 2°44 2°47 S117 
ae 7-42 oe 6°80 6°46 7590 
af 9 8-87 eek 9-738 
an 39°73 40°881 39°91 39°83 40°893 
: 11°07 11°714 11°03 11°09 11°616 
¢ (width) Le 38 Soe “37 ese gE 
4°87 ee 4°36 399 4-473 
cf 6 ae 643 eet 6°621 
ci 27°74 fone 28°61 e 28-040 
el 34°63 pecs 35°03 34°39 34°659 
de 8 sos Sane wae 
ef 2°04 [2-59]t 2°07 = 2°148 
eg 3 ‘ 4:23 4:02 
ej 24°90 ee ee 26°32 26°91 25-714 
tg 161 mites 2°16 ae 
ji 20°83 Aer 22°19 eg 21°419 
27°74 28°61 28°040 
gh 7°59 17°463 17°86 17°66 17°661 
hi 161 Came 2°16 pe 
hj 3°66 a 4°23 4°63 4°027 
hn 11°07 11-714 11°03 11°09 11°616 
OF] 2-0 [2°59]t 2°07 fags 2°14 
al 6°91 fo as 6°43 eee 67621 
in’ 9°46 eae 8°87 mean 9-738 
gk ae Sena me 
yl 4°87 poaies 4:36 3°99 4°473 
jn 7.42 ie as 6°80 6-46 
1 (width) rp Bou 0°37 i 
in 2°55 Pou 2°44 2°47 SLT 
mn Hed Sieg mpale pe eLaeae Bes 
Polar diam. as pee 16°51 eer rae 
* Bond’s results are given in terms of an=1-000, and not ina To utilize 
them I have supposed an=40"'47, by which they become ahtdetty: oulparabia 
with Mayer’s, the most complete series 
All the measures previous to 1880 I have treated on e supposition that they 
give a symmetrical figure to the system. I believe that ie original measures of 
Struve (1826) and of Secchi (1854) differ slightly from this supposition, but as I 
bo the data from 
have not access at present to their original papers, I have borrowed 
Kayser’s Memoir in the Leyde servations, vol. iii 
iin in 1852 wrote to t y=0" 
g 
Bond’s later (unreduced) observations give n in the same volume of the 
Harvard ier pages tory Annals as his first, tie usually estimates ef as less 
than one-half o 
