ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 



24a 



in absolute alcohol, to which a few drops of oil of cloves are added ; 

 they are then cleared up in oil of bergamot and xylol and mounted in 

 balsam ; or (2) they are stained with a saturated solution of toluidin 

 blue and differentiated in alcohol, to which a few drops of Unna's ether- 

 glycerin mixture are added. They are then cleared in bergamot oil and 

 xylol, and mounted in balsam. 



By this method the spirochaetae are stained black or almost black. 

 The illustrations show very clearly the effect of the procedure, and also 

 that the organisms are extremely numerous. 



(5) Mounting', including Slides, Preservative Fluids, &c. 



Clockwork-driven Turntable. — This ingenious instrument, which 

 was exhibited at the November Meeting, 1905, is the invention of 

 A. Flatters and W. Bradley (fig. 36). It is driven by a simple clockwork 



Pig. 36. 



arrangement, and one of its interesting features is that it is capable of 

 turning rings of any proportions from to 3 by l£ in. 



On its under surface the turntable has a pair of dovetails, which 

 slide in a dovetail fitting attached to the top of the vertical spindle, 

 rotating with it and causing the turntable to rotate also. 



Below the dovetailed fitting is a small steel disk attached to a sliding 

 piece that can be moved to the right or left out of the centre of the 

 vertical spindle by means of long set-screws. The distance the steel 

 disk is moved out of the centre line of the vertical spindle determines 

 the length of the oval. Attached to the under-side of the table are two 

 studs projecting downwards, each having a small roller on its lower end 

 that is in contact with the steel disk. When the latter is moved to the 

 right or left it presses against a roller, and shifts the table out of the 



R 2 



