1898.] MICBOSCOPICAL JOURNAL. 131 



then want a piece 19 inches by 20 inches; this must 

 then be cut into, strips 19 inches long, two measuring 

 65 inches in width, and two 4J inches in width. These 

 when joined up at the edges will form a box 19 inches 

 long by 5i by 4J inches. To form the corners it is 

 advisable to get a carpenter or joiner to make angle 

 pieces of oak or beech, the section of which will be some- 

 what like an L, with equal width of the vertical and 

 horizontal arms. On to these angle pieces, which 

 which must be about 1 inch wide and 19 inches long, the 

 millboard may be fastened by fish glue and short brass 

 brads ; the angle pieces must be inside. Having made 

 this box^ fasten the focussing frame on to one end with 

 fish glue and brads. Measure the exact external size of 

 this box and procure some more millboard, and fix up in 

 exactly the same way, so that it will just slide outside 

 the other box. You will then have a camera with a 

 sliding body, which will extend to 36 inches and close up 

 to 18 inches. If thought desirable a third section may 

 be added, but this will hardly be required. In place of 

 millboard it is possible to use black twill, lined with 

 ruby fabric. What is wanted is a sleeve of black cloth 

 with elastic run into the four edges so as to make it 

 contract and enable it to be pulled out. 



If cloth is used, the focussing frame must be screwed 

 to a stout wooden frame, which is provided at both sides 

 with brass tongues and screws to screw into a stout 

 wooden plank, so as to keep it upright. The millboard 

 is preferable. 



To make the camera front it is merely necessary to 

 procure a piece of wood of the same size as the back and 

 to this fasten the millboard or cloth sleeve. A hole 

 must be cut exactly in the centre, of such a diameter as 

 to take the tube of the microscope easily, with about a 

 quarter of an inch to spare. Now procure a piece of card- 

 board postal tube about 4 inches long, and glue this into 



