201 



PROCEEDINGS. 



June 27th, ISJS.—Chainnan, Dr. R. Braithwaite, F.L.S., 



President. 



The minutes of the preceding meeting were read and confirmed. 



The following donations to the Club were announced — 



*' The Monthly Microscopical Journal " from the Publisher. 



" Science Gossip " ,, ,, 



"Proceedings of the Eoyal Society," No. 141 the Society. 



'* The American Naturalist " in exchange. 



"The Lens" „ 



"Proceedings of the Literary and Philosophical") r. ,, ^ . , 



Society of Manchester " ) 



Nineteen slides Mr. Jas. Watkins. 



Twenty-four slides Mr. T. C. White. 



r Mr. Henry Horn- 



£3 for the purchase of Books for the Library ... < castle, of Whit- 



^ more, Notts. 



The thanks of the Meeting were unanimously^ voted to the donors. 



The following gentlemen were ballotted for and duly elected members of tho 

 Club :— Mr. Alfred S. Corbitt, Mr. H. G. Glasspool, Mr. Thomas Mason, Mr. 

 B. W. Priest, Mr. G. R. B. Ray, Mr. Frederick Reeve, Mr. Joseph E. Symons, 

 Mr. G. J. Smith, and Mr. Edward Souter. 



Dr. G. W. Royston-Pigott read a paper entitled, " A Description of the New 

 Interference Markings in Lepismaand Podura." The subject was illustrated by 

 diagrams. 



A vote of thanks was unanimously passed to Dr. Pigott for his paper. 



Mr. S. J. Mclntire said that he had only seen Dr. Pigott's exhibition once, 

 and that was at his own house. It certainly struck him on that occasion that 

 Dr. Pigott was a most skilful manipulator with high powers. He had himself 

 worked a great deal at Podura scales, and in endeavouring to understand their 

 structure he had thought it well to obtain as much knowledge as possible of the 

 structure of insects' scales generally In examining a large number of them for 

 this purpose, his conviction was strengthened that with high powers there was 

 the greates difficulty in deciding what was really seen. With regard to the 

 beads which had been described, he had frequently seen them, but at the same 

 time he doubted their actual existence. There was in the structure of some 

 scales a deposit of a fatty substance, and it was quite possible that this might 

 exist in those of the Podura, and might give rise to some such appearances, 

 although he thought it was more probably a result of interference. Dr. Pigott 

 was the first to discover and draw attention to these appearances, and he was 

 understood to believe in their entity, and that the club-shaped markings were 

 illusions. He (Mr. Mclntire), on the contrary, believed that the club-shaped 



