HARDWICKE'S SCIENCE-GOSSIP. 



57 



MICRO-rHOTOGRAPHY. 

 T^HE rough 



■*- arrangement 



sketch represents a home-made 

 I have been using lately with 

 success for micro-photography with an ordinary 

 quarter-plate camera. 



A wooden table is made a quarter of an inch wider 



adjustment screw (b) ; use a large diaphragm on the 

 microscope base. Expose, etc., in the ordinary way. 

 A little practice will soon show the right exposure to 

 be given, always using the same lamp. A small 

 beading round the top of the table holds the camera 

 firmly. 



David Wilson Barker. 



Focussing 

 screw 



Fig. 28. 



round the top than the front of the camera — through 

 the centre^of which a hole is cut that will easily take 

 the tube of the microscope. The lens is removed 

 from the camera, which is then placed front down 

 on top of the table ; the microscope is placed 

 underneath, with the eyepiece pointed into L the 

 camera through the hole in the table as represented 

 in the figure. The light is prevented from penetra- 

 ting the camera by means of a small silk sleeve (a) on 

 to the tube. A good lamp is to be used for illumina- 

 ting. Focus roughly by hand, and then finely on to 

 the ground glass of the camera, by means of the fine 



A MUD-CAPPED DYKE. 

 By the Rev. Hilderic Friend, F.L.S. 



[Continued front p. 18.] 



LET us now proceed to examine the dyke itself. 

 In so doing we shall give the cap our earliest 

 attention, and then inspect the stones. 



11. The Dyke.— Here it stands, as a defence 

 against the intrusion of bipeds and quadrupeds, and 

 as a means of keeping cattle within their proper 

 limits. To the eye, this "staen dyke" is anything 

 but pleasing ; it is often in ruins or decay, and if not 



