26 



Art. 3— K. Sotome ; 



As the temperature continues to fall during the latitude ob- 

 servation in one night, we may tentatively but reasonably assign 

 the following mean corrections to the latitude corresponding to 

 each of the groups, — 



Now in the reduction of the chain method it is assumed that 

 the latitude is constant during the observation of two groups in one 

 night, and under this supposition the star places are reduced to the 

 mean of the whole system. But when the apparent latitude ob- 

 tained from observation requires the said correction, the reduction 



