190 



Mr. SiDEBOTHAM also exhibited a new finder for hi^h 

 powers. It consists of squares formed by crossing lines, one 

 hundredth of an inch apart, enclosing progressive numbers, 

 executed by photography. He promised to prepare a number 

 for the use of the members, all to be exactly alike 



Mr. Joy exhibited a nose-piece, made for him nearly two 

 years ago, consisting of a diaphragm plate, under which are 

 screwed four objectives of different powers ; the centreing is 

 so true, that he can use the three-inch as a finder for the J or 

 even |-inch power. Several members of the Section have 

 nose-pieces made upon the same principle. 



Mr. Linton and Mr. Watson exhibited the tuft scales on 

 the upper wing of the Peronea Cristana and others. 



