440 H. S. Summers : 



I.— Moldavite from Radorailitz, near Budweis (Light biown). 



IT. — Moldavite from Radoinilitz, near Budweis (Light green). 

 111. — Moldavite from Radomilitz, near Budweis (Dark green). 

 1 V. — Moldavite from Tribitsch. 



V. — Moldavite from Budweis (Light green). 

 VT.— Moldavite from Tribitsch. 



The norms, are as follow : — 



I. II. III. IV. V. VI. 



The sub-rangs. into which these analy.ses fall are : — 



I. — (Radomilitzose). 



IT. — (Moldavose). 

 III. — (Budwei.sose). 

 IV.— (Moldavose). 



v.— (Moldavose). 

 VL— (Moldavose). 



It will be seen that the composition of the nioldavites differs 

 considerably from that of the obsidianites. In this case, again, 

 we have almost unique compositions such as are rarely met with 

 among the igneous rocks of the earth. Dr. Suess strongly 

 upholds the cosmic origin of these bodies, and also of the 

 billitonites and australites= obsidianites. 



Summapy and Conclusions. 



Six recorded and three new analyses of obsidianites are 

 brought together and compared by means of the American 

 classification of igneous rocks. 



It is shown that the analyses indicate compositions rarely met 

 with amon" terrestrial rocks. 



