PROCEEDINGS OP THE SOCIETY. 661 



the straight slide was to be preferred, as it could be pushed higher 

 or lower in the body-tube until the best position was found. 



The President thought that so far as an amplifier was useful — 

 and in many cases it was useful — the form which Mr. Mayall had 

 exhibited was a good one. 



Mr. Conrad Beck exhibited and described a new form of Micro- 

 scope lamp (supra, p. 628). 



The President thought that the lamp was most ingenious and 

 satisfactory, and that many of the arrangements were such as would 

 be of great utility to working microscopists. 



Messrs. Swift's lamp, a cheaper form of the one shown at the 

 March meeting, was also exhibited by Mr. J. Mayall, jun. 



Mr. F. F. Hazlewood's note was read as to a human spermatozoon 

 with two tails. 



Dr. Anthony confirmed the statement that the occurrence of this 

 variation from the normal type was not unprecedented. 



Mr. J. Brennan's further communication on the Potato-blight 

 Insect was read. 



Mr. Cheshire described an organism which he exhibited, and 

 which was identified by the President as a Spirochsete. 



The President said the specimen showed considerable variation in 

 the length and number of the spirals. 



Mr. E. H. Griffith's new form of turntable was exhibited and 

 described by Mr. Crisp. 



Dr. Anthony read his paper " On Drawing Prisms," and illus- 

 trated the subject by numerous specimens of drawings of micro- 

 scopic and other objects. 



The President said the subject of Dr. Anthony's remarks was one 

 of great practical importance to all who desired to make microscopical 

 drawings correctly. He had used various forms himself, such as 

 Wollaston's, Zeiss's, and Nachet's, though he thought he might say 

 that he inclined towards the Wollaston, with which he had made his 

 drawings of the flagellum of Bacterium termo. Although at the 

 time he did not know why, he had found it quite necessary to tilt 

 the drawing table in the way Dr. Anthony had described. 



Mr. Crisp exhibited, in connection with Dr. Anthony's remarks, 

 an ingeniously contrived drawing rest, which had been sent some 

 time ago by the Geneva Physical Company, and which he thought 

 met the want which Dr. Anthony had felt. It was an adaptation of 

 the principle of the one figured at p. 565 of vol. ill. (1883) of the 

 Journal. 



The President said that when working he had a somewhat similar 



