379 



to demonstrate the method of using the polariscope with the highest 

 powers. In conclusion, he drew their attention to some diagrams illustrat- 

 ing the various accepted views of the markings in the diatomacese. One 

 diagram showed those on the P. Formosum, passing from simple striae to 

 white dots, next to black dots, thence to squares, which he regarded as the 

 true picture. He impressed on all who wished to carry on investigations in 

 this line, to focus, and adjust on the silex itself, and let the markings take 

 care of themselves. He acknowledged that it was a matter of no little 

 difficulty, but with time and patience the eye would become educated up to 

 it. After the demonstration, the proboscis of a blow fly was shown on a 

 Powell and Lealand No. 1 stand, Wenham binocular, and 1 inch Powell and 

 Lealand objective (1857); also a P. Formosum, showing "squares," on a 

 Jackson-Lister by Swift, with T L. by A. Ross, upwards of 30 years old. 

 The various pieces of apparatus, upon which Mr Nelson had commented, 

 were on the table. 



The following objects were exhibited in the library : — 

 Spores of Quillwort (Isoetes) ... 

 Anthrax (Bacilli) in spleen, from a case of 



splenio fever ... 

 Crystals of Theobromine 

 Dipterous larva, sp. 

 Sand from Salt Lake 

 Leptus autumnalis 

 Lepidocyrtus curvicollis... 

 Epistylis ... 



Lopliopus crystallinus ... 

 Actinophrys Eichhornii... 

 Photographs of Salicine, taken by ordinary, 

 and by polarized light 

 Lava, from Eifel, by polarized"! 



light j 



Trachyte, from the Rhine, by ) 



polarized light ... j 



,, Andesite, by polarized light ... 



Fang of molar tooth, showing dentine') 



and crusta petrosa ... ... ... ) 



Section of Kidney (Human) ... 

 Diatom, Triceratium Hardmannianum 



Attendance— Members, 88 ; Visitors, 13. 



'} 



Mr. F. W. Andrew. 

 Mr. W. I. Curties. 



Mr. J. Epps, Junr. 

 Mr. H. E. Freeman. 

 Mr. H. G. Glasspoole, 

 Mr. H. R. Gregory. 

 Mr. G. E. Mainland. 

 Mr. C. Le Pelley. 



>» >> 



Mr. C. Rousselet. 



Mr. G. Smith. 



» 



» 



>> 



>> 



L. S. 



M 



»> 



)} 



») 



>» 



Mr. F. Steele. 

 Mr. G. Sturt. 



