(9) 
m=2 for: Dearborn Obs. (7, Hoven), Mt. Hamilton (both 
refractors), Princeton (23-inch), Virginia Univ., and the 
26-inch of Washington. 
m= 1.5 for: Cambridge (Mass.), Cincinnati, Glasgow (Mo.), 
Malta, RuTHERFoRD & WAKELY, PERROTIN, BIGOURDAN, 
O=, RusseLL and the small refractor at Washington. 
m==1 for all the other observers at refractors of at least 9-inch 
or reflectors of at least 20-inch aperture. 
Farthermore : 
n= 4 for more than 6 nights. 
n= 3 for 4, 5 or 6 nights. 
n= 2 for 2 or 3 nights. 
n= 1 for 1 night. 
Zg was multiplied for every yearly mean by the (computed) 
distance 7 in order to reduce to arcs of the great circle and so to 
obtain comparable weights. Finally to every yearly mean Obs. — 
Comp. a weight p= , rounded off to tenths, was assigned. 
reg 
_100 
Observations deviating more than 0”5 (in are of the great circle) 
were always excluded. 
By comparing Obs.—Comp. for every observer with the corres- 
ponding ordinate of the curve, corrections were deduced whose mean 
furnished the following personal corrections (the weights, according 
to the number of nights, being taken into consideration). 
Observer. Ab = | Observer. Ad = Observer. Ab = 
== == = 
Bigourdan +0°77| 3 | Hall —0°33/2 and 4] Stone +1°79) 3 
Bond —0.09, 3 | Holden +1.12 4 | Struve —0.53| 3 
Burnham —0.28) 4 | Hough +0.24) 4 Wilson +1.10) 3 
Dunér +0.16; 2 | Howe 40.07, 38 | Winlock +0.56) 3 
Engelmann |—0.45) 2 | Newcomb +0.09,2 and 4] Young —0.15)2 and 4 
Foerster +0.05; 2 | Peirce —0.94; 3 
Frisby —0.96) 4 | Pritchett (C.W.)|—0.71| 3 
The measurement of SrRUVE at Rome gets the weight 2. Bury- 
HAM’s measurement in 1881.85 at the 12-inch at Mt. Hamilton is 
united to his measurements at Dearborn Obs.; likewise the measure- 
ments of ENGELMANN at the 74-inch and the 8-inch at Leipzig 
and those of Newcoms at the small and the great refractor at 
Washington. For Young and Hatt the corrections obtained for the 
