122 Trans. Acad. Sci. of St. Louis. 



pressure correspond to what we should call a modern vacuum. 

 How would a cosmical mass of gas having a density of 1.93 X 

 10~ 15 grammes per cc. under pressure of 1.49 X 10 -10 atmos- 

 pheres and at a temperature of 27000° C. appear, when viewed 

 as a distant body? 



Issued May 18, 1904. 



