PROCEEDINGS OF THE SOCIETY. 373 



The President welcomed Mr. Fuller, Ex-President of the State 

 Microscopical Society of Illinois, Chicago, U.S.A., who was present at 

 the meeting. 



Mr. Beck called attention to a section of the stem of the lime tree 

 which he presented to the Society ; it was of two and a half years' 

 growth, cut slightly obliquely through the junction of a branch with 

 the stem, and contained starch, raphides, &c., in situ. 



Mr. Beck also described and exhibited an improved form of 



Microscope with swinging Substage (see p. 329). 



Mr. May all exhibited and described, by means of black-board 

 sketches, a now traverse lens by Mr. Tolles. 



Mr. Dunning exhibited and described a new form of Turntable, 

 by means of which it was easy to revarnish slides which had been 

 excentrically mounted (see p. 333). 



Mr. Crisp exhibited Klonne and Miiller's " Demonstration Micro- 

 scope," together with the revolving object-stage devised by Mr. Lobb 

 (see p. 144). Also a sjiecimen of Micrometric ruling made by Professor 

 Rogers, of Harvard University, Mass., U.S.A., with his new ruling 

 machine. 



Mr. James Smith explained his method of illuminating Podiira- 

 scales, diatoms, &c., under high powers (see p. 331). 



M. Nachet's paper, " On a Petrographical Microscope," was read 

 by Mr. Crisp (see p. 227). 



Dr. H. Gibbes read a paper " On the Double and Treble Staining 

 of Animal Tissues for Microscopical Investigations, with a note on 

 Cleaning thin Cover-glasses." 



Mr. Stewart said ho had examined many of Dr. Gibbes' spocuucns, 

 and if pernianent they would be very excellent additions to the 

 cabinet. Of course time alone could show whether they were per- 

 manent or not. 



Dr. Gibbes also exhibited a yV homogeneous-immersion Objective 

 (l)y Powell and Lealand), wliich, witli the ordinary Wenliam prism, 

 showed both fields fully and ecjually illuminated. The front part of 

 the objective containing tlic lenses (,^,^ of an inch in dejith) was mado 

 to unscrew just behind the back combination, aTid was attaclied to n 

 short adapter which, when screwed into tlie body of tlic ]\[icroscM)po, 

 left the objective projecting only ,',, of an incli below the tube. Tho 

 oi)tical comljiiiation was thus brought very closo to the prism, and no 

 part of either field was cut olV. 



