ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 81 



(6) Miscellaneous. 



Quekett Microscopical Club.* — The 493rd Ordinary Meeting of the 

 Club was held on November 25, 1913, the President, Professor A. 

 Dendy, F.R.S., in the chair. The President described a " Red Water 

 Phenomenon due to Euglena.' n J. Burton (Hon. Sec.) read a note " On 

 the Disk-like termination of the Flagellum of some Euglense." Earliest 

 reference to this was Science Gossip, 1879. Saville Kent, "Manual of 

 Infusoria," p. 382, refers to the same phenomenon. After careful in- 

 vestigation the writer had to come to the conclusion that there is no 

 disk, no bull), or sucker, or anything of the sort or the end of the 

 flagellum. The appearance is due to the " kinking " of the protoplasm 

 of the flagellum, a quite common occurrence, and the " disk-like " ap- 

 pearance is observed when the distal end has happened, in coiling or 

 kinking, to touch a part of the flagellum just behind the end, and has, 

 in fact, overlapped and adhered to it. J. Burton also read a note on 

 " A Method of Marking a given Object for Reference on a Mounted 

 Slide." When the object is large enough to be recognized with a 

 hand-lens, place a dot of water-colour over it large enough to be seen 

 with the naked eye. When dry turn a small ring of dark cement round 

 it on a turn-table. When the cement is hard, remove the water-colour 

 with a damp brush. For objects too small to be recognized without a 

 higher power — find and centre the object with a suitable power. For 

 the objective first employed substitute a water-immersion say, a ^ ; put 

 on the front lens as small a drop of water as can be used, carefully focus, 

 and centre. Then rather sharply raise the Microscope tube, and a tiny 

 circular spot of water will be left on the cover-glass over the desired 

 place. Colour this drop with water-colour, dry and ring as before. Any 

 close-working objective may be used for this purpose if a water-immer- 

 sion is not available. E. M. Nelson, F.R.M.S., " On the Measurement 

 of the Initial Magnifying Powers of Objectives." 



The 494th Ordinary Meeting was held on December 23, 1913. 

 B. M. Draper exhibited and described "A Live Box for the Observation 

 of Insects and similar Objects." He also recommended the use of the 

 ordinary concave Microscope mirror, employed with lamp and bullseye, 

 for the illumination of any large opaque object under the lowest powers. 

 The mirror should be made removable, and can then be fixed, when re- 

 quired, to the upper side of the stage on the end of a jointed arm giving 

 universal movement. B. M. Draper, " Dark-ground Illumination with the 

 Greenough Binocular Microscope." The best form of patch-stop was 

 found to be two small circular patches placed side by side and opposite 

 the two front lenses of the twin objectives. E. M. Nelson, F.R.M.S., 

 " A Peculiar Form of Diatom." E. M. Nelson, F.R.M.S., " On Amphi- 

 pleura lindheimeri." A coarser form of this well-known test has been 

 found having 67,000 striae per inch instead of about 77,000 in the older 

 form. The new Lindheimeri may be recognized by its very long terminal 

 nodules, each nodule being one-third of the whole length of the valve. 



Feb. 18th, 1914 G 



