COLLECTION OF BDELLOID AND OTHER ROTIFERA. 



229 



diameter. " Small J inch " is particularly good. It is procur- 

 able at the chemical shop, and costs 3d. per length of 3 to 4 feet. 

 The upper end of the pipette, on which the finger tip is to be 

 pressed, must first be seen to. It must be cut clean, so that 

 when the finger is firmly pressed on it no air can pass. A slight 

 inequality can be reduced by holding the end in the flame of a 



E 



L 



I 



Fig. 2. 

 About one- fifth actual size. 



gas jet and bringing it just to the melting point. If too rough 

 or jagged, a fresh end must be made. Glass tubing is cut by 

 nicking it with a three-sided file and breaking across. When 

 the end is satisfactory, the piece of tubing is held in the gas 

 flame about 3 inches from the end, and heated until it begins 

 to bend. As it bends, the two extremities are pulled steadily 



