GASES EVOLVED FROM GLASSES 



125 



It will be observed that glasses No. 1 and No. 2 are soda-lime glasses; 

 3, 4 and 6 are soda-lead glasses; 5 is a boro-silicate of lead and soda. 



Experimental Results 

 The results of the determinations are shown in Table II. 



TABLE II. 



Gases Evolved from Glass of Known Chemical Composition During Heat Treatment 



in Vacuo 



* P.G. = Permanent Gases. 



