215 
obtaining a powerful light on the object without an elevation 
of temperature. Mr. Dancer thought the movement might 
be molicular, and similar to that observed in particles of 
camphor or gamboge in water. 
Mr. Binney exhibited some specimens of wood, and also 
some fine sections of canes. 
Mr. Parry exhibited some excellent microscopic photo- 
graphs of woods and fossils. 
Mr. Dancer shewed the spines of the Aphrodita, proving 
that the prismatic hues exhibited by them were due to the 
longitudinal lines on their surface. 
■ 
