380 CAROLINE IV. BALDWIN. [Vol. III. 



W.a. Lines which appear equally strong in all parts of the arc. 

 Seventy such lines were counted. 



II. ^. Lines which become stronger as we go out from the center. 

 Seventy-nine of these lines were mapped. 



W.c. Lines which are not visible or exceedingly faint at the 

 center of the arc. There are eighteen of these, of which exact 

 positions for twelve have been given in a previous paragraph. 



11.^. Lines which have their maxima in other sheaths, 2 or 3, 

 rather than in the center or at the edge of the arc. There are 

 sixteen such lines upon the photographs.^ 



II. r. Lines which have more than one maximum. Six such 

 lines were noted. 



The lines of division I. are as a rule stronger at the positive 

 carbon, while the lines of II. are usually stronger at the negative 

 carbon. W.b. and II. r. are especially strengthened at the negative 

 carbon,. 1 1, rt'. to a less extent. 



The calcium lines 4581.66 and 4586.12 appear as single lines 

 at the negative carbon, but at the positive they seem to be double. 



^ There is reason to think that at least ten of these are titanium lines, but the evidence 

 is not conclusive. 



