122 Trans. Acad. Set. of St. Louis. 



pressure correspond to what we should call a modern vacuum. 

 How would a cosmical mass of gas having a density of 1.9o X 

 IQ-is 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? 



Iss^te(l May 18, 1904. 



