12 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 69 



sistent with the observations of Dorno on various optical atmospheric 

 phenomena and of Stormer on the aurora. 



There is a moist haziness associated with water vapor which pro- 

 duces losses from the direct solar beam throughout the spectrum of 

 about 2 per cent. There is perhaps a slight indication that this 

 varies in the same direction and from the same causes as does a u \. 



astrophysical observatory, 



Smithsonian Institution, 



Washington, D. C, 



March, 1918. 



Errata to Vol. 68, No. 8, Smithsonian Miscellaneous Collec- 

 tions, Water Vapor Transparency to Low-Temperature 

 Radiation, by F. E. Fowle. 



P. 44: The ordinates of Fig. 15 should have been called " Frac- 

 tional transmissions." 



P. 45, Table 10: The values given for a u \ are for the altitude of 

 Mount Wilson, barometer 62.3 cm. For sea level they are as follows : 



x 0.342 0.350 0.360 0.371 0.384 0.397 0413 0431 0.452 0.475 



„:\ 



•53i -565 -597 -631 -662 .706 .742 .771 .808 .835 



X 0.503 0.535 0-574 0.624 0.686 0.764 0.864 0.987 1. 146 1.302 

 a aX .861 .877 .885 .914 .950 .974 -984 -990 -995 -996 



X 1.452 1.603 L738 1.870 2.000 2.123 2.242 2.348 

 o tl \ 098 -999 -999 -999 -999 -999 -999 -999 



