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IV. — On a Simple Form of Mount for Microscope Objectives. 

 By E. L. Maddox, M.D., Hon. F.R.M.S. 



Plate I. (Upper portion). 

 To others who, like myself, occasionally do a little glass grinding, 

 the following form of mount may prove useful. It was made about 

 two years ago. It consists of the usual outer tube (Fig. 3), but 

 near the shoulder, on the outside, are turned a few threads of a 

 coarse or fine screw, as desired, on which works the fine adjust- 

 ment collar ; a slot, below or in front of the threads, permits a steel 

 pin, which screws into the inner core or tube, to slide up and down 

 according as the collar is rotated, the inner tube being carried up 

 by a couple of turns of steel wire (indicated by a dotted spiral line 

 in the figure), forming a spring, which works in a small space near 

 the neck of the mount, bearing against a shoulder in front and above, 

 against a stop attached to the top of the inner or core tube, which 

 carries, as usual, the back and middle cells. It works quickly, 

 easily ; has a considerable range, and no sensible slip ; moreover, 

 its construction is not difficult. 



V.— On Bog Mosses. By E. Braithwaite, M.D., F.L.S. 



5. Sphagnum subsecundum Nees von Esenbeck. 



Sturm's Deutschl. Fl. Crypt. Fasc. 17 (1820). 



Plates III. and IV. 



Syn — Funk, Moos— Taschenberb. p. 4, T. 2 (1821). Nees and Hornscb. 

 Bryol. Germ. I, p. 17, T. 3, fig. 7 (1823). Bridel, Bry. Univ. I, p. 8 (1826). 

 Hubener, Muse. Germ. p. 26 (1833). C. Miiller, Syn. I, p. 100 (1849). Scbimp. 

 Torf. p. 74, Tab. 22 (1858). Synop. p. 682 (1860). Lindb. Torf. No. 11 

 (1862). Hartm. Skand. Fl. 9th ed. II, p. 82 (1864). Itussow, Torf. p. 71 (1865). 

 Milde, Bry. Siles. p. 392 (1869). Sph. contortum subsecundum Wilson Bry. Brit, 

 p. 22, T. LX (1855). 



Dioicous. Tall, slender, crowded in soft tufts of various colours, 

 glaucous-green, yellowish-green, brownish or ochraceous. Stem 

 solid, brown or blackish, somewhat glossy, with a single thin layer 

 of cortical cells. Branches flagelliform, 2-3 arcuato-patulous, 1-2 

 pendent, less elongated, not appressed to stem ; the retort cells per- 

 forated at the slightly recurved apex. Cauline leaves small, from a 

 broad insertion, broadly ovate, minutely or distinctly auricled, 

 cucullate at apex, finally flattened and very minutely fringed, 

 narrowly bordered, upper hyaline cells fibrose and porose, the lower 

 almost free from fibres Ramuline leaves laxly incumbent or 

 patent, more or less subsecund, broadly acuminaio-elliptic, very 

 concave, with the margin involute in the upper half, narrowly 

 bordered, the point 3-5 toothed ; hyaline cells flexuose, elongated, 

 very small, with annular and spiral fibres generally forming a net, 

 pores very numerous at the bach, minute, in two rows along tlie 



