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-" grammes per cc. under pressure of 1.49 X 10"^° atmos- 

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

 as a distant body? 



Issued May 18,1904. 



