D. Trowbridge on the Nebular Hypothesis. 41 
no advantage. 
61. The following table gives the time of rotation of the sev- 
eral planets so far as known: 
Taste VII. 
Planet. Time of retation.| on 5 oe 
Bos Ss. 
MMOrcury...cnsae ts +s 24.2 5. 28 0:200979 
OWNS cs caw cans pee oo 2k 2A 0°383390 
Barth, 6. 23 56 41] 0521348 
Mars, 24°87 22 0:°779537 
Jupiter, 9 55. 26 4876551 
BCU. an dy vee 10 29 17 8-618608 
By the above table we see that, roughly speaking, the time “ 
Bq ; 
Since the outer rings were less dense than the inner ones, the planets would 
have farther to contract than the inner ones, and this also w increase the rota- 
tory velocity 
— 
Aw. Jour. Scr.—Szconp Serres, Vor. XXXIX, No. 115.—Jan., 1865. 
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