666 
SUMMARY OF CURRENT RESEARCHES RELATING TO 
projecting parts from both top and bottom of frame. Reverse the centre 
wheel, putting the larger end of shaft uppermost, and making all bearings 
tight and smooth without oil. Cut a brass plate (soft) 3 inches in 
diameter; find centre, bore, then bore two more holts 1J in. from 
centre ; make a pair of light bowed springs, solder to nail fitting such 
hole and fit tightly through plate, placing the clips in opposition to each 
other. Cut or scratch three concentric circles 1/4, 1/2, and 3/4, turning 
table rapidly. Fit the centre shaft firmly to plate without soldering. 
The apparent disadvantage of using a cogged wheel in turning with 
the hand is more than counteracted by the greater ease and consequent 
steadier rotation, together with greater speed, attained by this table. 
Carefully made it will do as good or even better work than the ordinary 
form. If preferred the clips may be soldered fast to plate, but are 
rather unhandy. 
The holes in the bottom of frame can be utilized to secure to firm 
base and hand-rest in any convenient manner to suit the requirement of 
the maker.” 
Cheap Boxes for Slides.* — Mr. Henry Shimer writes: — “W. P. 
Hamilton’s slide-box described in the January number reminds me of a 
very nice arrangement. A box ready-made is more apt to be used 
than one made on purpose ; for instance, the ordinary cigar-box, 
costing nothing. The flat ones are most suitable. They vary in size 
somewhat, but the ordinary one is about 4J by 8J by 2 in. inside. It 
can be filled with cardboard trays like Hamilton’s, or with wooden ones 
made of cigar-boxes. The bottoms and lids will make bottoms for the 
trays, and the sides and ends sawn into narrow strips 1/8 or 1/4 in. wide 
and tacked on with brads, will make the margins. Each box will hold 
five trays. The bottom may be used instead of a tray by tacking a 
marginal strip on each end. Each of such boxes will store 70 short 
German slides, which by all odds are preferable, or it will hold 45 to 50 
of the 3-in. slides. If we make the trays of cardboard, as per Hamilton, 
and a 3-in. holds 24, 2-in. holds 16 trays. Then 14 short slides to a 
tray gives room for 224 slides ; 9 3 -in. sheets to a tray gives 144 slides, 
or 7 to a tray will give 112 slides, and allow about 3/4 in. margin on the 
sides and a little less on the ends. Such boxes are neat, cheap, and 
convenient. The slides lie flat. These boxes can be numbered or 
otherwise labelled on the ends and stowed in bookcases.” 
Braatz, E. — Ein neues Mikrotom. (A new Microtome.) 
Illustr. Monatsschr. d. Aerztl. Polytechn ., XI. (1889) p. 159. 
G a riel. — C hambre claire du Microscope. (Camera lucida.) 
Progres Med ., VIII. (1888) No. 51. 
Pettigrew, J. B. — On the use of the Camera Lucida. 
Trans. Manchester Micr. Soc., 1888, p. 80. 
(4) Photomicrography. 
Mr. Pringle’s Photomicrographic Apparatus.— The two figures now 
given (plates XII. and XIII.) will, without further comment, supplement 
the description of Mr. Pringle’s photomicrographic apparatus which was 
given on p. 543 of the Journal. 
* Amer. Mon. Micr. Journ., xi. (1890) p. 106. 
