1905] Henderson — A Memoir. 87 



Unfortunately our information as to how these suffixes are 

 to be applied is inadequate and certain postulates have to be 

 made as to how the intersections occur.* This notation of 

 Salmon was the first one that was given for the twenty-seven 

 lines, and was superseded by a very superior one to be 

 explained in the next article. 



♦Of. Salmon, 1. 0. 



