164 Miscellaneous Intelligence. 
observed, with data for their computation. The principal addi- 
tions consist of the mean places of about 180 stars, making 383 in 
all, for the convenience of field astronomers, more lete data 
3 
for eclipses, data about the transit of Venus, and largely increased 
information about the satellites of the planets. 
5. Aurore: their Characters and Spectra; by J. Ranp Capron. 
F.R.A.S. 207 pp. 4to. London, 1879. (E. & F. N. Spo 
spectrum of the aurora, and the various magneto-electric experi- 
ments that have been made which tend to throw light upon its 
cause. The various theories that have been advanced to account 
and more apparent the more closely the subject is studied. At 
the present time nearly all the States have their Geological Sur- 
veys so far advanced that-nothing further can be done until these 
States are completely mapped by triangulation and topography 
on a sufficiently large scale. Such a survey is of great import- 
rv 
plete survey of his farm, with all undulations of surface ne 
j ands an 
e 
work over a given area, with the certainty that every separate 
area so surveyed would ultimately join as a pa th 
with the accuracy attainable only by scientific processes of pre- 
cision. : 
It is quite certain that large areas of the public domain, rer 
for purely agricultural purposes, could be more economically an 
accurately surveyed, for purposes of sale, by triangulation than 
