2-j8 THE MICROSCOPE. 



NEW CONGRESS NOSE-PIECE, PATENTED 1883. 



BY W. H. BULLOCH. 



THIS attachment has been designed to meet the requirements of 

 the working microscopists for the rapid changing of objectives 

 from one power to another, or for the comparison of objectives. 

 All the nose-pieces heretofore designed are open to the objection of 

 want of stability when using objectives with screw collar adjustment; 

 by turning the collar either to the right or left the objective is liable 

 to fall off the stand, but with the nose-piece here designed the ob- 



jective is held as secure as with society-screw and can be changed 

 from one power to another in five or ten seconds. To release the 

 objective from stand, turn the collar of attachment which allows the 

 adapter to be taken out. The nose-piece is made either with society 

 screw or Butterfield broad gauge. Price of nose-piece, including 

 two adapters, $5.00; New Congress Safety Nose-Piece, $7.00. 



THE ILLINOIS STATE MICROSCOPICAL SOCIETY. 



AT a regular meeting of the State Microscopical Society of Illi- 

 nois, held on November 9th, Dr. F. W. Mercer spoke of the 

 use of the electric light in reference to microscopical illumination. 

 Two forms of lamps were exhibited; one with pointed top and one 

 of globular form, of about 27^ candle power. Either an accumulator 

 or ordinary battery could be used as a source of electricity. The 

 light from these lamps is far superior to that from other sources. 

 Dr. J. J. M. Angears, of the College of Physicians and Sur- 



