1092 PROCEEDINGS OF THE SOCIETY. 



immersion objectives it had ceased to have any definite meaning what- 

 ever. ^ 



Dr. Maddox exhibited and described a modification of his Aeroconi- 

 scope for collecting particles from the atmosphere. 



Mr. Crisp explained the properties of monobromide of naphthaline 

 proposed by Professor Abbe for mountiug diatoms. Its refractive 

 index was stated as 1'658, and its "index of visibility" (on Mr. 

 Stephenson's theory) as double that of Canada balsam, or 22 when 

 used on diatomaceous silex (see p. 1043). 



Dr. Edmunds inquired if it was unchangeable. 



Mr. Crisp said it did not seem to have been very long in use. It 

 could be obtained in London. 



Dr. G. W. Royston-Pigott's paper " On a new Method of Testing 

 an Object-glass, used as a simultaneous Condensing Illuminator of 

 brilliantly reflecting objects, such as minute particles of Quicksilver " 

 (see p. 916), was, owing to the lateness of the hour, taken as read. 



Mr. Stewart's paper, " On some Structural Features of Echino- 

 strephus molare, Parasalenia gratiosa, and Stomopneustes variolaris" 

 (see p. 909), was also taken as read. 



The following Objects, Apparatus, &c., were exhibited:— 



Mr. O. Brandt : — Photographs of Pleurosigma angulatum and Frus- 

 tulia saxonica. 



Dr. Carpenter : — Wale's Working Microscope and Iris Diaphragm. 



Mr. Coppock : — Eotating Holders for At wood's Eubber Cells. 



Mr. Crisp: — The nine Microscopes mentioned on p. 1086; and 

 Botterill's Life Trough in Ebonite. 



Mr. H. G. Hanks : — Santa Monica Earth, and Section and Photo- 

 graphs of the San Bernardino Meteorite. 



Mr. Lettsom : — Abbe's Binocular Eye-piece. 



Prof. A. Liversidge : — " Tripoli " from Kichmond Kiver, N. S. W. 



Mr. J. Mayall, junr. : — Hyde's Illuminator. 



Dr. Maddox : — Modified Aeroconiscope. 



Messrs. Powell and Lealand: — Amphipleura pellucida with ^^ 

 homogeneous-immersion objective, and their modification of the 

 vertical illuminator. 



Mr. Stewart : — Various Echinoderms illustrating his paper. 



Mr. Swift : — Microscope with " Calotte " Diaphragm. 



New Fellows. — The following were elected Ordinary Fellows : — 

 Sir Henry Cotterell, Bart., and Messrs. F. M. Balfour, M.A., F.R.S., 

 John Henry Cooke, and Levison Edward Scarph, M.A. 



Walter W. Eeeves, 

 Assist.-Secretary. 



