Smithsonian Report, 1906. — Lacroi; 



Plate III. 



VuLCANiAN Bombs (Bread-crust Structure on the Right). 

 Andesite from Mount Pelee i1902i. 







^>9f— '^ 



•e-^aff^*^ 



VULCANIAN Explosion Rising from the Crater of Vulcano 



(1889>. 



(I'liotogniph by Silvestri, contribiUe.l by Friedlander.) 



