On the Transit Instrument in determining Latitude. 58 
posed to be indispensable for this purpose. It indeed admira- 
bly answers the end for which it was mvented, and in respect 
to simplicity, convenience, and efficiency, leaves almost nothing 
to be desired. But being expensive, and of limited use, it is 
likely to be in the hands of but few observers. The suggestion, 
‘therefore, of additional instrumental facilities for using this meth- 
of latitude, so as to render it more widely available, may not 
be considered as without value. 
mainly on the fact that its results jer fea on these simple and 
pointed out. Where both latitude and longitude are to be de- 
_ termined at the same station, as is usually the case, a single in- 
