8 Astronomy. 
: r : nearl 
203-74 © 204 y- 
the same as in my previous note, Q becomes 
On 
: ; 1 1 
The compression on the fluid theory becomes s0ee oa07 
1 : 
the theory of abrasion the compression is —-~ deg The first is much 
- nearer to the observed sega — Aare the last. 
April, 1 
" Giscrsattens of the Transit of Venus, Dec. 8-9, 1874. 
Part I. Washington: Government Printing Office. 1880. Edi- 
ted by Smmon Newcoms.—This is the first of four proposed parts 
in which the Observations made and-reduced under the direction 
of the Commission created by Congress are to be published. The 
remaining parts will give the observations in detail, the discussion 
of the longitudes of the stations and the measures of the photo- 
t pa 
es the general account of the operations and the reduction 
i results of the gbeets shone and oo might have been the 
last esta of the first part. 
The iactasoe of the errors and discrepancies among the pho- 
tographic results, and the determination of a value of the solar 
arallax are not given, as the Astronomische Gesellschaft has 
discouraged the publication of separate results for the solar par- 
allax until the whole of the Beats of all parties can be com- 
bined in a single discussion. The remark is made, however, that 
the probable error of the photographic siedbishenaents far exceeds 
what was ego) estimat 
The fourth chapter nay a treatment of the contact observa- 
tions, of which twenty-five were secured. These, also, are reduced 
to the form of observation equations, very like those from the 
photographs. 
The leasons which these results furnish with ape to the 
observations of the transit in 1882 are not'deve eloped, it seems 
probable that the photographic methods must be Suprived, or else 
i. HAM 
3. Observations of Double Stars made at the U. 8. Naval 
Observatory ; by Asapn Haxrt.—Professor Hall has given in 
