ZOOLOGY AND BOTANY, MICKOSOOPY, ETC. 533 



The single fluid used with it is one devised by Prof. H. L. Smith, liavin^ 

 an index as nearly coincident with that of the front lens as anything jet 

 devised. Thus it will readily be seen that by doing away with one of the 

 fluids and yet not impairing the performance of the objective, its value is 

 greatly increased as a convenient working lens."] 



The Microscope, V. (1885) pp. 73-5. 

 Nelson, E. M. — Short v. Long Tubes. 



[One of the objections to a short tube is that deeper eye-pieces are required 

 to maintain the same magniflcation, and there is no doubt about the 

 disadvantage of deep eye-pieces.] 



Engl. Mech., XLI. (1885) p. 132. 

 „ „ See Monocular v. Binocular. 



"Nemo." — Amateur Microscope Construction. 



[A serviceable plain instrument is, he considers, within the power of one who 

 is fairly skilful at lathe and metal work, and he suggests the publication 

 series of articles on the ' Construction of the Microscope.'] 



.Engl. Mech., XLI. (1885) p. 127. 

 Oldham, W. P. — See Monocular v. Binocular. 

 " s." — Microscope Construction, 



[Reply to query as to making a Microscope. " The glass-work must be 

 purchased, but a really intelligent man who can use his lathe ought to be 

 able to make for 20s. that for which he would pay an optician loT."] 

 [" Any decent amateur can construct such an instrument as a Microscope 

 without a special series of papers other than what have appeared in the 

 E. M."] 



Engl. Mech., XLI. (1885) pp. 151 and 193, 

 Pelletan, J. — Microscope Mineralogique de M. E, Bertrand. (Mineralogical 

 Microscope of M. E. Bertrand.) 

 [Same as that described Vol. III. (1883) p. 413.] 



Journ. de Microgr., IX. (1885) pp. 163-6 (1 fig.). 

 PuMPHEEY, W. — [Apparatus for photo-micrographs and method of producing 

 them.] 



Midi. Natural., VIIL (1885) p. 113. 

 E., E. D. — See Monocular v. Binocular. 

 "EoB. Oeus." — The Micro-objective. I., II. 



[Description of a " plan by which the amateur optician may produce a fair 

 combination." Two plano-convex lenses with foci 2 : 1 placed with planes 

 to object and at a distance apart equal to half the sum of their focal lengths 

 — the shorter focus lens being a thick one. With perfectly central light 

 the definition of thin objects is very little troubled with colour and not at 

 all distorted.] 



Engl. Mech., XLI. (1885) pp. 214 (1 fig.), 258 (1 fig.). 

 Seaman, W. H. — Microscopical Societies and Microscopy. 



[Abstract of address at the first Annual Soiree of the Washington Microscopical 

 ^ Society.] 



Amer. Mon. Micr. Journ., VI. (1885) pp. 87-9, and 98. 

 Smith, C. Vance, death of. 



[" The deceased was noted for his skill in preparing vegetable tissues for the 

 Microscope."] 



Journ. of Set., VII. (1885) p. 244. 

 Steinheil, A. — TTeher die Bedingungen und Fehler von Objectiven aus zwei 

 Linsen. (On the conditions and aben-ations of Objectives of two lenses.) 



Zeitschr.f. Instrumentenk., V. (1885) pp. 132-6 (1 fig.) 

 from Astron. Nachr., No. 2606. 

 [S TO WELL, C. H. and L. E.] — [Beads of Amphipleura pellucida.'] 



[Americans should bear in mind that the slide from which Dr. van Heurck's 

 photograph was made was prepared by Dr. A. Y. Moore. " We have seen 

 one of these photographs, and the appearance of the heads is unmistak- 

 able."] 



The Microscope, V. (1885) p. 91. 

 Tindall, E. a. — See Monocular v. Binocular. 



