6 B. E. Moore 
components from the position of the undisturbed line. Column B 
gives “remarks.” Inasmuch as duplicate “remarks” frequently 
cccur, they have been designated by the following abbreviations, 
viz.: D, diffuse; D,, diffuse toward the red; Dz, diffuse toward 
the blue; D; and ZY, diffuse inward and outward respectively, 
which generally suggests the presence of interior and exterior 
weak components respectively; w, slightly broadened; b, much 
broadened; 4, and ~, blue and red components respectively over- 
lapped by component of an adjacent or foreign line; mi, not 
identified, i. e. the line does not compare with any line in Exner’s 
and Hascek’s tables. Special remarks are indicated by numbers 
which are explained at the foot of their respective tables. In the 
quadruplet tables, the s- and p-components are each designated 
by a double sign + to avoid repetition. The s-component is 
recorded first. The double sign, therefore, means two readings. 
The triplet s-components are similarly designated and the p-zero 
component is omitted. Two intensities are frequently given in the 
triplets. The first recorded value, then, represents the s-component 
and the second the p-component. When there are three intensi- 
ties for triplets, the outer s-components are unequally intense. 
The first reading is, then, the red and the third the blue compo- 
nent. When only one intensity under triplets is given it refers to 
the s-component, and the f-component has twice the intensity. 
IV. Barium 
The barium lines for wave-lengths shorter than 5854. were meas- 
ured from plates exposed by Professor Runge. Much time was 
spent in trying to obtain stronger photographs of barium to bring 
out the weaker lines. These lines were either not upon the new 
plates or too diffuse for satisfactory measurements. A few of 
the sharpest lines of the new plates were measured and found in 
agreement with measurements made from Professor Runge’s other 
line. These observations and those by Professor Runge upon 
barium I have reduced to the field strength, 24400 C. G. S., used in 
all subsequent measurements. The photograph of the red spec- 
trum yielded all lines but two in Kayser and Runge’s arc spectrum 
6 
