“ 
Miscellaneous Intelligence. 405 
stars from each other being regarded as constant, the scale values 
become at once determinate. Four couples of stars were used in 
the measures bie a Centauri, and two couples in those upon 
Sirius and u 
se rowiitte have been of such value that the British Govern- 
t has ordered for Dr. Gill the construction of a seven-inch 
seraaloen by Messrs. a pore It is pr opened’ to use this rts 
material has been brought together in sud volume. It opens 
with a chapter on the history and properties of the metals and 
their iors and then goes on to the special Siocon of the non- 
ferrous meta ie to which el book is devote Picco copper, tin, 
The latter at is devoted to the discussion of the strength and 
elasticity of the metals and alloys that have been mentioned, the 
t 
the various elements are arranged number savin one hundred, 
and they are accompanied by numerous diagram 
3. A Treatise on the Adjustment of Obiberbasiony; with appli- 
cations to Geodetic work and other measures of Precision, by T. 
- Wricut. 437 pp. 8vo. New York, 1884 (D. Van Nostrand). 
—This is a practical treatise giving a sytematic account of the 
method of adjusting observations founded on the principle of the 
mean, with a discussion of the applications especially to geodetic 
and astronomical work. Numerous examples and illustrations 
taken chiefly from American sources add to the value of the work. 
he principal topics discussed are : ate of error, the adjustment 
of direct observations of one unknown, adjustment of indirect obser- 
vations, of condition observations, application to the ppaoergee' of 
triangulation, to base-lit asurements, to leveling, and so on 
tw 
were present, some very ih Movelais were reached. In 
midnight of the initial meridian, coinciding with the beginnin 
of the civil day and date of that meridian, and to be counte 
from zero up to twenty-four hours. 
