3 [Proc. B.N.F.C., 



prior to the sad event of his death. He had been well known and 

 esteemed by the members who worked in the botanical section 

 Before calling upon Mr. Dewhurst to deliver his lecture, he would 

 like to congratulate Mr. Nevin H. Foster, M.B.O.U., on making 

 a remarkable discovery. He had found in his garden at Hills- 

 borough a very rare Woodlouse — Trichoniscus pygmtzus. It was 

 new to Ireland, and up till quite recently it had only been found 

 in Norway. Within the last month or two it had been discovered 

 near Glasgow and Newcastle-on-Tyne. He thought they might 

 all congratulate Mr. Foster on his success. The Chairman called 

 on Mr. Dewhurst to deliver his lecture on " Volcanoes and 

 Volcanic Action." 



This was the first time Mr. Dewhurst had appeared before a 

 Belfast audience, and the lecturer had a cordial reception. In 

 introducing his subject he gave a definition of a Volcano, and 

 proceeded to show the relations existing between Volcanoes and 

 Geysers. He then said that Volcanoes which are unceasingly 

 active, such as Stromboli, and Cotopaxi, are exceptional and 

 experience comparatively mild eruptions. Stromboli, the " Light- 

 house of the Mediterranean," has been in a state of constant 

 activity since the earliest period of history, ejecting steam, 

 fragmental materials, and lava. First-class eruptions are shown 

 by Volcanoes of the Vesuvian type, which are intermittently 

 active. The lava meets with resistance in the vent, and the 

 steam pressure increases until the lava is forced out with great 

 explosive violence, shattering and Assuring the cone, while various 

 fragmental materials are shot high into the air, and rivers of white- 

 hot molten rock flow down the sides of the volcano. Steam is 

 discharged in enormous quantities, and often issues copiously 

 from the flowing lava. Acid fumes may be emitted, as at 

 Vesuvius, and, descending with the rain, produce great devasta- 

 tion. The lecturer then drew attention to the stupendous explosive 

 eruption of Krakatoa, and to the brilliant sunsets of the following 

 Winter and Spring, which were produced by the finest particles of 



