230 DAVID BRYCE ON THE COLLECTION OF ROTIFERA. 



apart until tlie tube is divided, each piece having a tapering 

 point bent over to one side. A small terminal opening (say about 

 ■^^ inch diameter) at right angles to the tip of the pipette is now- 

 made by careful grinding on a stone or the face of a file. It 

 is useful to finish off the pipette by marking it near the upper 

 end with a ring of red sealing-wax or bright-coloured cement, to 

 make it conspicuous and easily found. A pipette used for any 

 special purpose, such as dealing with narcotised specimens, 

 should have a special mark, and be kept apart. 



I find a pipette of 3 inches length the most convenient for use 

 with the stage-troughs described. The larger pipettes wdth 

 rubber teats or covers take up too much fluid and are more 

 difficult to control, although admirable for dealing with larger 

 quantities. 



The staging (fig. 2, a, b, c), which forms an important part of the 

 damp chamber (fig. 2, d), is made from galvanised wire, with the 

 help of pliers. Tw^o pieces of stout wire are each bent to the 

 form shown in lateral view fig. 2, a. With rather finer wire 

 passing from one upright to the other a series of shelves is made 

 as shown in fig. 2, b. Finally the two pieces are bound together 

 at each end as in fig. 2, c (end view). 



The bottom of the dish being filled with old moss (kept very 

 wet), the feet of the staging are pushed into the soft layer, which 

 gives a sufficiently safe foundation. 



JouTU. Quekctt Microscopical Club, Ser. 2, Vol. XIII., No. 80, April 1917. 



