Astronomy and Mathematics. 245, 
We would remark that the observations of Mr. Burnham in 
1880, 1881 and 1882, powether with nearly all the previous meas- 
urements of Struve and otl rers, (corrected, if necessary, by 180°) 
can be satisfied by an apparent orbit of 11°6 years, the principal 
star central, the semimajor axis 0’-38, and semiminor 0"°10. 
é couple in 1883 was ve ery close. The measures then taken 
are Hot, however, are ge bbe well by this orbit. They indi- 
the he peri now known, will be watched hereafter shes 
au in 
Senge on Pr ojections ; by THomas Craia, 4to pe 
and 
treats of the whole subject of map. projections. It consists of 
two separate portions, the are and larger one being devoted t 
the Mathematical Theory of Projections, and the second to the ‘ 
Construction of Projection 
€ first section in he: first t part is given to the various kinds 
of perspective projections of a spherical surface on a plane, 
Then n follow two sections on orthomorphic projections, or those 
im which figures on any one surface are represented upon any 
Phic, ~~ pF aviealens and the Development pesleas 
cond part is independent of the first, ak is a intended’ for 
practic <3 ise. It gives the methods of constraction of the several 
Projections, and is followed by slnetycme tables. H. A. Ny 
IV. Misce,.tanrovus Scientiric INTELLIGENCE. 
Distribution of the Magnetic Declination in the United 
Staies at the Epoch January, 1885, with three isogonie charts and 
One plate. Secular Variation of the Magnetic Declination in the 
United States and at some foreign stations, (Fifth pore 
plat ° 
With four es he above are titles t important 
sie siggy r. © A. Scnorr, published (as stated 
a 42 of = volume), as append to the report for 1882 of 
t and Geodetic pct J. E. th Superin- 
