358 PKOCEEDINGS OF THE eOCIETY. 



before the Society. Mr. C. Lees Curties effected the resolution of the 

 object ; for the remainder I am responsible. The plate used was a Hunter 

 and Sands " Premier," giving about thirty on Warnerke's scale, and the ex- 

 posure was half-an-hour, though less would probably have sufficed. The 

 light was obtained from a Paragon lamj}, using, of course, the edge of the 

 flame. 



As an evidence of progress in another direction, perhaps equally im- 

 portant to the pbotomicrographer, the negatives which accompany the 

 Amphipleura specimens may not be without interest. They represent 

 salicine crystals as viewed by jiolarized light, and the colours were pur- 

 posely selected to test as severely as possible the capacity of the plate used — 

 a Dixon's orthochromatic. I have employed these plates for such work, 

 with growing satisfaction, for a considerable time. They fail, from 

 exigencies of manufacture and development, at the red end of the spectrum, 

 but even there are far superior to any others with which I have met. 

 The objective used was Zeiss's A, with eye-piece, exposure three minutes 

 or thereabout. Neither negative has been retouched." 



Mr. H. Watts' s letter was read, accompanying a slide of a rare forami- 

 nifer found by him in the Miocene deposits of Victoria, believed to be some- 

 what unique, as it is the first time it has been found fossil. It was, 

 however, seen on one or two occasions in the ' Challenger ' dredgings, but 

 then only two specimens. A second slide sent by Mr. Watts was of the 

 last new species of Marine Hydroida found in Victoria, during 1886, 

 named after the discoverer, Plumularia Wattsii. 



Dr. Crookshank exhibited two photomicrographs of Flagellated Pro- 

 tozoa in the blood. These photographs were taken with Zeiss's 1/18 

 homogeneous-immersion from a preparation stained with magenta. The 

 amplification (1750) was obtained by enlargement from the original 

 negatives. They illustrated the employment of the Eastman bromide paper, 

 and the value of photomicrographs for teaching purposes. The flagella 

 and the delicate longitudinal membrane were clearly demonstrated. The 

 negatives were not retouched. 



Mr. J. M. TurnbuU's sliding nose-piece and adapter, which was awarded 

 a silver medal by the Eoyal Scottish Society of Arts, was exhibited and 

 described by Mr. Crisp {supra, p. 295). 



Mr. W. A. Haswell's description of a rotating stage and circular slides 

 for large series of sections was read, and the photographs sent by him 

 exhibited (sui)ra, p. 297). 



Mr. A. Frazer's centering nose-piece for use with double nose-pieces 

 was exhibited and described by Mr. Crisp {supra, p. 294). 



Mr. W. Waison exhibited and described the Watson-Draper Micro- 

 scope, a new instrument which he had made on the designs of Mr. E. T. 

 Draper. The Microscope is an elaboration of the Watson-Crossley form, 

 and the idea of the designer is " that when the object is on the stage, 

 either it may be made to rotate in any direction, horizontal or vertical, 

 round a fixed beam of light without the light ever leaving the object, or 



