MICROSCOPY. 375 



borized, of the cylinder-axis. (2) The nervous net-work of 

 the involuntary unstriated muscles is in connection, not with 

 the elementary nervous action which sets the muscle in ac- 

 tivity, but a more complex action, on which depends the 

 functional energy of an organ whose activity is derived from 

 the direct action of the nervous centres. 



MISCELLANEOUS. 

 New Acarus. 



A new acarus, Cheyletus flabellifer, is described by A. D. 

 Michael, F.R.M.S., which he found feeding upon the rare 

 acarid Glyeiphagus palmifer. But one species of Cheyletus 

 was before known, and from it the present form differs in 

 being more thick-set and powerful, and the hairs, instead of 

 being fine, are developed into fan-shaped expansions. The 

 color is yellowish-white [Journal of the Royal Microscopical 

 Society, July, 1878). 



Insect Dissection. 



Mr. W. T. Loy uses the following simple apparatus for in- 

 sect dissection. An upright iron rod is fixed into a heavy 

 metal foot; round this rod is coiled one end of a stout wire, 

 the other end being bent into a ring to hold a watchmaker's 

 eye-glass. This arrangement, by pressing the head down, 

 focuses the lens upon the work, while both hands are at 

 liberty. With this simple apparatus Mr. Loy has made some 

 very beautiful dissections. A very good condenser may be 

 made out of a Florence oil-flask, cleansed and filled with 

 water, and then securely corked. The medium most suita- 

 ble for dissecting in is glycerin {Jour. QueJc. Mic. Club, Jan., 



1878). 



Pedesis. 



Professor Stanly Jevons, in objecting to the names "Mo- 

 lecular movement," " Brownian movement," and " Dujardins 

 titubation," for the movement of particles suspended in liq- 

 uids, suggests pedesis from the Greek leaping, or bound- 

 ing. The best exhibition of this motion is to be got by 

 grinding up a particle of pumice-stone in an agate mortar, 

 and mixing it with distilled water. The minute particles 

 will be seen under the microscope to leap about with an in- 



