838 
PROCEEDINGS OF THE SOCIETY. 
in finding the barb on the end. This barb he thought clearly showed 
the analogy which ran all through the whole of those things. He might 
also mention that Dr. Gibbes had demonstrated a curious thing on the 
tail of a spermatozoon, a kind of spiral thread encircling it. Mr. C. 
Beck and Dr. Gibbes had made this out, and shown nine turns in this 
curious wiry thing. This had on a former occasion been exhibited at 
the Society in one of Dr. Gibbes’ preparations. 
The Chairman said he felt sure they would give all due credit to 
Dr. Maddox for the way in which he had worked at this somewhat 
difficult subject, although he might not have noted some of the things 
mentioned by Mr. Nelson. Personally, he found that with advancing 
age his own eye had lost something of its delicacy of perception. 
Their thanks were due to the author for the paper which they had 
heard read, and also to Mr. Dowdeswell for his note on the subject, 
and to Mr. Nelson for his further explanations and remarks. 
Mr. E. M. Nelson then exhibited and described — 
(1) An elementary centering apparatus for use on the substage of 
cheap .students’ Microscopes. 
(2) Photographs illustrating the secondary structure of Navicula , 
taken with a 1/8 in. objective N.A. 1*4, X 1430; also another of the 
same X 800, taken with direct light ; also of proboscis of blowfly, with 
Zeiss’s new apochromatic 1^ in., and the same taken by an ordinary 
cheap object-glass, which really produced the better picture of the two, 
in consequence of the very small angle in Zeiss’s lens ; also the same 
by a new apochromatic lens, by Reichert ; also three photographs to 
show the same diatom as seen with 1 in., 1/2 in., and 1/4 in. objective ; 
also a high-power view, showing the test on the proboscis of the blowfly ; 
also one of Navicula spectabilis, showing new structure, with Powell’s 
1/4 in. apochromatic, and one of Synedra , taken with a 1/8 in. objective. 
(3) “ A Note on Bacteria,” showing by means of photographs the 
flagellum of Spirillum X 1350 as single, and as divided into two and 
into four. 
The thanks of the meeting were given to Mr. Nelson for these 
c ommunications . 
The following Instruments, Objects, &c., were exhibited:— 
Dr. H. L. Maddox: — Photographs in illustration of his paper. 
Mr. J. May all, Jun. : — Premier Microscope. 
Mr. A. Pringle : — Photomicrographs of Bacterium Termo. 
Surgeon Y. Gunson Thorpe: — (1) Photomicrographs and negatives 
in illustration of his paper ; (2) Slide of Marine Annelid. 
Mr. A. T. Watson: — Specimens and photographs in illustration of 
his paper. 
Mr. G. Western: — Dinops longipes Hudson. 
New Fellows: — The following were elected Ordinary Fellows: — 
Messrs. Wynne E. Baxter, J.P., Henry Berger, William Rutherford, 
M.D., F.R.S., D. E. Haag, M.D., Henry R. Saunders, and J. Christie 
Wright. Dr. Henry B. Brady, F.R.S., and Prof. W. C. Williamsou, F.R.S., 
were elected Honorary Fellows. 
