242 The Microscope. 



its extreme height, by means of a micrometer screw placed between 

 the ways on which it runs. This screw has threads | millimetre 

 apart, and the large wheel, which turns the screw, bears three hun- 

 dred teeth upon its margin. This wheel is turned by means of a 

 pall which strikes the slender upright, seen in the cut, while a set 

 screw allows the pall to engage from one to twelve teeth at a revo- 

 tion. Thus, the instrument has a capacity of cutting sections from 

 -^-^ mm. to ^^0 mm., as desired. The object, imbedded in paraffin, 

 is soldered with the same material to one of the section holders, and 

 this is then placed in its proper socket and clamped. This part of 

 the apparatus is provided with proper clamps and set-screws, so that 

 motion is possible in the three dimensions of space, allowing perfect 

 orientation of the specimen. 



The present writer has used this machine for about three months 

 almost daily, and it has proven itself all that could be expected. It 

 is well made and simple, and it is an easy matter to cut with it rib- 

 bons three feet or more in length, without a break and without losing 

 a single section. The microtome is manufactured by the Educational 

 Supply Co., Hamilton Place, Boston, Mass. The price, with a good 

 knife, is $40. If one desires, an ordinary razor can be clamped in 

 the standard in place of the knife. 



Bloomington, III. 



PROCEEDINGS OF SOCIETIES. 



THE A. S. M. MEETING, 1888— CHANGE IN DATE. 



Champaign, III., July 4, 1888. 

 ^nr^HE date of the A. S. M. meeting has been changed by the 

 -*- Executive Committee to August 21, on account of the 

 change of the A. A. A. S. meeting to August 15, instead of 22nd, 

 as at first announced. My address for some weeks will be Bay 

 View, Mich. Truly yours, 



T. J. BuKRiLL, Secretary. 



We trust that every member of the Society will endeavor to be 

 present at this meeting, and will add their little or much toward 

 making it a success. The Columbus committee and local society 

 have arranged an attractive programme, besides that of the regular 

 session, and everything possible will be done to make the visiting 

 members feel at home, and render the occasion one of great pleasure 

 and profit. 



