64 1 (O- (CLEIANI EV ELIE JUN 
equal to the angular velocity of Neptune, its computed moment 
of momentum was 4848.055, while the present moment of 
momentum is 22.7666. The unit is an arbitrary one arising from 
the selection of convenient initial units. In this paper, Moul- 
ton’s unit is converted into Darwin’s unit, for convenience of 
comparison. It appears, therefore, that notwithstanding the 
concessions to the Laplacian hypothesis by which the present 
moment of momentum was made too large, and the nebular 
moment of momentum too small, the latter is still 213 times 
larger than the former. The dynamical law that demands con- 
stancy of moment of momentum is not even remotely fulfilled. 
A more rigorous computation, following the probabilities of the 
case without regard to its bearings on the Laplacian hypoth- 
esis, would increase the discrepancy. 
Individual discrepancies.—N ot only does the law fail of realiza- 
tion when the present system taken as a whole is compared with 
the ancestral nebula, but also in a comparison between the 
successive nebular stages and the corresponding parts of the 
present system. For example, the computed rotatory momentum 
when the nebula extended to Jupiter’s orbit, and included the 
Jovian mass, was 1996.420, while the moment of momentum of 
the present system, minus the moment of momentum of Neptune, 
Uranus, and Saturn, is 14.1816. The discrepancy here is more 
thansi4@ toy 1. 
When the nebula extended to the earth’s orbit, and included 
the terrestial mass, its moment of momentum was 857.330. 
The moment of momentum of the Earth, Venus, Mercury, and 
the sun, by hypothesis formed from this nebula, is only .71008. 
In this case the excessive estimate of the sun’s moment of 
momentum, due to the assumption of homogeneity, introduces a 
disproportionately large error, and yet the discrepancy is 1208 to 
1. Computing the sun’s moment of momentum on the basis of 
Laplace’s law of destiny, the discrepancy is 1801 to I. 
When the nebula extended to Mercury’s orbit, and included 
this planet’s mass, its moment of momentum was 512.290, while 
the moment of momentum of Mercury and the sun (excessively 
