Astronomy. 145 
and aim is to begin a few degrees North of Arge- 
lander’s aotihiem limit, say at 26° or 27°, and to carry southward 
a system of zone 0 observations to some declination beyond Gilliss’s 
northern limit, thus rendering comparisons easy with both these 
other labors, and permitting the easy determination of the correc- 
tions needful for reducing positions of any one of the three series 
to corresponding ones for the other. It is of course impossible to 
arrange in advance the details of such an emdonns but my ex- 
pectation is to go over the region in question in zones 2° wide, (ex 
cept in the vicinity of the Milky Way where the width would be 
but one-half as great,) up to a declination of about 55°, after which 
the width would be gradually increased as the declinations became 
greater. Within these zones all stars seen as bright as the 9th mag- 
nitude would be observed, so far as poeeible, moving the telescope 
in altitude when no bright star is in the until some one be- 
ped ee according to the well Kinin method of zone-obser- 
vatio 
be em mployedy inasmuch as the time now arin: for my absence 
from home wi be inadequate for proper discussion of the cor- 
wt is seat best to ance for a differential oumpitation at 
east . 
upon standard rhe ae So far as ms ig ropose ona ying 
those heretofore determined by me, and publishe pies the coast 
survey, which form the basis of the star ies American 
Almanac. 
bine others of a soaked character to some me Fn bat in the 
Lit si of a plan implying so much labor and effort, it would be 
unwise to rely bs the pascibility of accomplishing much more 
wo 
The Mprlpsi pica see relations of the ne are very peculiar, but 
I dare not undertak es of obser vaciars he: bearing 
upon these, without “self -registering spoatatna: which is beyond my 
means. 
versity, of the Western perso situated in 31° 8. we 
itude, on the boundary of the Paar gee the land begins to 
rise toward the group of mountains known as the Sierra de Cor- 
dova. It is connected with Rosario, on the rovems by the Cen- 
Am. Jour. Sci,—Szconp Serizs, Vou. L, No, 148,—Juxy, 187 
10 
