( 372 ) 



The tables I and II are analogous to those of Comm. N". 60, 

 only column K has been added to the former, in which the readings 

 from the kathetometer scale are noted down. In every measurement 

 they are always determined, in order to be used, if necessary, as a 

 control for the readings by means of the standard scale, in connection 

 with the collimation differences of the telescopes. 



TABLE I. 



DETERMINATION IN A BATH OF LIQUID HYDROGEN. 



(ABOUT —253°). READINGS. 



