40 



Logic, has discussed the Boolian method with a fulness and 

 ability that leave little or nothing to be desired. 



Mr. Wilde exhibited some volcanic dust -which fell at 

 Batavia, to the depth of three inches, from the great erup- 

 tion of Krakatoa on August 27th last. Dr. Burghardt had 

 made a microscopic examination of the dust, and found it 

 to consist of augite and several minerals fused into glassy 

 and amorphous globules. Some of the larger globules were 

 highly magnetic and indicated the eruption of ultra basic 

 lavas from great depths below the earth's surface. 



Mr. Wilde also exhibited some glassy lava from the great 

 volcano of Kilauea in Hawaii, and was known as " Pele's 

 Hair," — Pele being the name of the goddess of th e mountain. 

 The volcanic substance was abundantly produced by the 

 rapid passage of gases through the liquid lava, particles of 

 which were shot into the air, leaving glassy filaments behind 

 them. 



For the specimen of filamentous lava shown, Mr. Wilde 

 was indebted to Mr. F. Melland, who had recently visited 

 the crater of the volcano of Kilauea. 



