360 peocezddhGs of the society. 



styrax and Canada balsam. The latter was pure, but hardened by exposure 

 to a gentle heat. The styrax ('strained styrax of commerce'), dissolved 

 in benzol and filtered, should be of the consistence of olive oil or a trifle 

 thicker. The refractive index is of course less than that of pure styrax, 

 but higher than that of Canada balsam ; it is admirably suited for all the 

 more robust diatoms, from Eupodigais argus to Pleuro^igma angulatum. It 

 can be hardened over a Bunsen burner without the formation of air-bubbles 

 until it becomes brittle, which, however, is not desirable. Hardening does 

 not materially alter its colour. For the delicately marked diatoms I have 

 found nothing better than tolu. Preparations made two years ago are 

 still free from crystals of cinnamic acid. Prof. H. L. Smith, in the 

 beginning of 1886, kindly sent me some of his own preparations of bromide 

 of antimony in boro-glyceride, together with a score of slides in various 

 other media ; many of them were beginning to show crystals ; and at this 

 date (December 13th, 1886) the diatoms are obscured by dense crystals. 

 The slides prepared by myself with his bromide of antimony and boro- 

 glyceride, the covers cemented with litharge and red-lead mixed with gold 

 size fthe most durable of all cements — I have some insect preparations, 

 mounted, in cells 1/12 in. deep filled with dilute glycerin and spirit, as 

 perfect as they were when first mounted twenty-five years ago), are all full 

 of crystals and perfectly useless. This is much to be regretted as in every 

 other respect this medium left nothing to be desired. With a dry 1/6 in. 

 of Ross the lines on Sunrella gemma were easily resolved into dots, and 

 those on P. angulatum conld be seen with an old Eoss 14 in. of 74'. I 

 have several of Dr. Meates' sulphide of arsenic mounts, but they are spoilt 

 by crystallization." 



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



Mr. C Baker : — Xelson Model Microscope. 



Mr. Bolton : — Pedicellina cernua var glabra. 



Mr. E. C. Bousfield : — Photomicrographs oi Amphipleura pdlucida and 

 Salicine Crystals. 



Mr. Crisp: — (1) Tumbull's Sliding Xose-piece and Adapter; 

 (2) Frazer's Centering Nose-piece ; (3) Chabry's Capillary Tabe-slide. 



Dr. Crookshank: — Photomicrographs of flagellated Protozoa in the 

 blood. 



Drs. H. J. Johnston- Lavis, and G. C. .J. Yosmaer : — Sections of sponges 

 in illustration of their paper. 



Mr. W. "Watson : — New Microscope designed by Mr. E. T. Draper. 



Mr. H. Watts : — Slides oi Astrorhiza angulom and Plumularia Wattsii. 



Hew Fellows: — Ihe following were elected Ordinary Fellows: — 

 Messrs. E. B. L. Brayley, W. Lynd, W. Stratford, M.D., A. E. Weightman, 

 Surg. K.X., H. Weld-Blundell, E. Henslowe Wellington, and W. P. Young. 



