124' The Microscopk. 



ber at once by narrowing the tubing at proper intervals and 

 cutting with a file. The sharp edges of the glass shouldTje rounded 

 oif by softening in the flame. In use the tube is filled with liquid 

 by compressing the rubber and then relaxing while the narrowed 

 tip is immersed. On removing from the bottle and again com- 

 pressing the rubber the fluid may be delivered in such quantity 

 and just where desired. I find this bottle especially serviceable 

 in washing, staining, and clearing sections or objects that are 

 fixed to the cover glass rather than to the glass slip previous to 

 immersion in the mounting fluid. 



By the way, I find the method of floating objects on the cover 

 glass, staining, arranging, etc., so much more preferable to the 

 old methods that I wonder is not more recommended. In 

 mounting a section of kidne}', for instance, I remove the section 

 from the 50 per cent, alcohol solution to a watch crystal filled 

 with distilled water. The alcohol in the section causes it to float 

 out perfectly straight on the surface of the water. I have ready 

 a cover-glass in a watch-spring clamp and lift out the specimen 

 on the glass without the slightest pucker or ruffle. A few drops 

 of staining fluid may now be added from the dropper above 

 described, and the cover glass laid on a plate under a watch crys- 

 tal or bell-jar. When the stain has set sufficiently, the excess 

 may be drained off, the specimen washed by slightly inclining 

 the cover glass and using the dropper. The preparation is then 

 dried by holding in the fingers over the flame, a drop of turpen- 

 tine added from its dropper, the excess drained or absorbed at 

 the edge of the cover glass, followed by a drop of balsam. The 

 cover is then inverted and lowered to the centre of the slip. 



CIRCULATION IN THE LIVER-LOBULES. 



DR M. F. WEYMANN. 



In examining the liver of a rat I recently made the observation- 

 that the circulation of blood in the viscus can be watched almost 

 as well as the blood stream in the web of a frog's foot. A few 

 trial repetitions developed the fact that the liver to be examined 

 must come from an animal killed without the loss of any blood,, 

 that the hepatic vessels must be tied before removal, and the 

 portion to be examined should come from near the surface. It 

 'is not necessary tliat the organ be entirely fresh, for a specimeiL 



