616 F. A. Per ret — Some Kilauean Ejectamenta. 



trajectory in sending the greater mass of the liquid to the ends 

 by centrifugal force. 



The material is a greenish glass, indicative of the rapid cool- 

 ing, and which is highly vesicular — more than one-half of the 

 mass consisting of gas vesicles. Notwithstanding this fact, 

 the surface skin is uniformly continuous, giving no indication 

 of the interior condition, and is of a matte-smooth finish almost 

 black in color. The presence of gas vesicles in the interior 



Fig. 6. 



^\ ^ £«**. '^^^ ^^^ J^^ 



iliu£^& 4 ctfiiii' 



Fig. 6. Miniature bombs or lava drops. 



lowers the specific gravity of the drops, as units, to an average 

 of about 1*04, some of the larger specimens having less than 

 1*00 and floating in water. 



It would be interesting to know if these drops are due to 

 fresh lava welling up through the cones of ejection, or 

 whether — as suggested to the writer by Mr. I. Friedlaender — 

 they ma} 7 be a refusion product of the substance of the cones. 

 It is hoped that this and other points may be determined by a 

 microscopic and chemical analysis. In the lightness and fra- 

 gility of the product, together with the unaltered surfaces, we 

 have reasons for supposing the formation to have been com- 

 paratively recent. 



As is so frequently the case, when a new product is dis- 

 covered in one locality it is afterwards found in many places ; 



