Journal of Applied Microscopy. 



571 



The burette E, which is graduated, is 

 closed at L by a glass rod, O, which is conical 

 at the lower end and serves as a stopper to 

 the burette at L. Below is an opening, K, 

 which acts as an outflow. The glass rod con- 

 sists of two parts, the upper, C, hollow with an 

 opening at O, the lower, D, of solid glass. 

 On the lower end of the burette at P is a bell-jar either 

 fastened by a rubber band or soldered directly to the 

 burette. The upper part of the burette is closed at N 

 with cotton. 



For sterilizing the apparatus it is, for the sake of sim- 

 plicity, divided into two parts. The upper vessel R with 

 its connection B is taken and closed at a with a small 

 glass rod, and together with the pinchcock M is sterilized. 

 The cork below is removed with the burette and the 

 upper tube C covered with cotton. After sterilization 

 the burette is held fast by a suitable stand, and the vessel 

 R placed in a corresponding ring so that the rubber 

 connection B can be easily drawn over the tube C. 



The lower end of the rubber connection is now care- 

 fully flamed with a Bunsen burner, the glass rod removed, 

 the cotton stopper burned, and the rubber tube drawn 

 over the tube C. The bell-jar is then closed with a 

 sterilized cork upon which has been placed a little cotton. 

 If it is desired to use the apparatus the pinchcOck M is 

 opened and the burette filled up to the desired mark. By 

 lifting the glass rod C the conical end L is raised and the 

 burette emptied. If the cork stopper has to be taken out, it is advisable to 

 moisten the cotton layer with two or three drops of a 40 per cent, formaldehyde 



solution. 



Korn, Otto. Eine einfache Vorrichtung zum 

 Erhitzen der Farbstofflosiing bei der Tuber- 

 kelbacillen-farbung. Centrlbl. f. Bakt. ite 

 Abt. 25: 422-423, 1899. 



H. H. W. 



The writer prefers to stain cover-glass 

 preparations by floating them, bacillus 

 side down, in a watch glass of hot 

 instead of heating the 



staining fluid 

 stain on the cover-glass, as this process drives 

 the water out so rapidly that crystals are 

 likely to be formed. 



The figure shows a convenient device for 

 heating the watch glass. A piece of coarse 

 wire is bent to form a handle at one end, and 

 the rest of it is made into a circle measuring 

 from five to seven cm. Over this a slightly 

 concave piece of wire netting is placed and the edges bent around to fasten it 

 to the circular frame. The watch glass is easily handled with this, and the wire 

 netting keeps the flame from cracking the glass. E. M. Brace. 



"^^^^SB^ 



