Vol. 8, 1922 
PHYSICS: G. R. HARRISON 
263 
to date. Apparently Holtsmark's result of less continuous absorption 
in potassium than in sodium was due merely to difference in vapor density. 
Curves are given for potassium in figure 2. 
a. Temp. 3SO°C. 
Pressure Scm. /it/dro^en 
C. Temp SSCC. 
Pre35L/re /Zcm hcfc/ro^en 
Potassium 
This work is being conducted under the guidance of Dr. D. L. Webster, 
whose aid is gratefully acknowledged. 
1 Wood, PUl. Mag., 8, 18. 1909 (530). 
2 Holtsmark, Physik. Zs., 20, 1919 (88). 
3 Hackspill, Ann. Chim. Phys., 28, 8, 1914 (613). 
^ Van der Lingen and Wood, Chicago, Astroph. J., 54, 1921 (149). 
