90 THE MICROSCOPE. 



the disk. At the other end, I made a ring to fit the draw tube, 

 and then bent the intermediate wire. I attach mine below the 

 flange, on the draw tube, where there is no lacquer to be scratched, 

 but if it should be thought desirable to attach it above the flange, 

 then the ring ought to be covered with chamois, so as not to wear 

 the polish. 



The advantages of this form are, the small size of the disk and 

 its support, interfering with the working of the instrument and 

 view of the stage as little as possible. The support is not in the 

 way of the nose; the support is elastic, not uncomfortable when 

 touched by the nose, and striking it does not displace the stand; 

 it can be rotated about the tube and used with either eye alter- 

 nately; it can be easily adjusted to the eye distance of any worker; 

 and, lastly, it is of so simple a construction that any one can make 

 it for himself, at a very small cost, two or three cents only, in addi- 

 tion to the time. — Medical and Surgical Reporter. 



New Method of Preparing the Spinal Cord for Micro- 

 scopic Sections. — Dr. Debove, according to the Archives de Neur- 

 ologic, highly recommends the following method of hardening the 

 spinal cord for microscopic sections, Place the cord in a solution 

 (four-per-cent) of bicarbonate of ammonia for three weeks, then in 

 a solution of phenic gum for three days, and for three days more in 

 alcohol. Sections may then be cut with great facility. They should 

 be placed in water to prevent curling. They are then immersed in 

 a saturated solution of picric acid for twenty-four hours, and colored 

 with carmine for about twenty minutes, the picric acid acting as a 

 mordant. — Louisville Med. Nc7i>s. 



