APPARATUS 



15 



For staining on the slide, Stender dishes are very convenient. The 

 form shown in Figure 11 A, about 60X90 mm., is in general use. Some 

 prefer the Coplin jar, shown in Figure IIB; but it is troublesome to 

 clean, and if sHdes are placed back to back, as shown in the figure, 

 water is carried up in dehydrating and xylol is carried down. When a 

 large number of slides of the same kind are to be stained at one time, 

 the cheap and practical device, shown in Figure 12, is a time-saver. 



It is simply a coil of brass wire, 0.064 inch in diameter (No. 14, 

 Band's gauge), wound so that the coil is about | inch across. Such a 

 coil, carrying 15 slides, will go into an ordinary Stender dish, except 

 that the coil projects enough to prevent the cover from fitting. Taller 



A B 



Fig. 11. — Staining-dishes: A, Stender dish; B, Coplin jar 



glasses, from the five-and-ten-cent store, can be used for the absolute 

 alcohol and xylol, which must be kept well covered. We have been 

 using a coil made from wire 0.051 inch in diameter (No. 16 Band's 

 gauge), wound so that the coil is If inch across. It holds the slides 

 and the ordinary Stender dish can be covered. 



Biological supply houses use rectangular staining dishes and holders 

 carrying 50 slides. 



Solid watch glasses, or Minots, as they are often called, are always 

 useful. Each student should have a dozen or more. 



Each student should have three bottles of about 1-liter capacity 

 for 90 per cent alcohol, absolute alcohol, and xylol. In addition, a 

 half-dozen bottles, holding about 100 c.c, will be useful. There should 

 be two bottles, holding about 50 c.c, for clove oil. If one is doing 

 much research work, it will be convenient to have many more bottles 

 for graded series of alcohols and xylols. 



