DESCRIPTION OF THE ACHROMATIC MICROSCOPE. 145 



6. In a flat drop of new wine laid on the tablet or disc 

 of the aquatic live box, but not compressed by the cover, 

 the motion was a regular uniform circulation, the par- 

 ticles rising from below at one end of the drop, then 

 passing straight across on the surface, and descending at 

 the other end. 



