Apparatus 



15 



holding 20 to 30 slides, so that all may be transferred at the same 

 time from one reagent to another. With this convenience, it is not 

 necessary to handle the slides separately, except at critical stages. 



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 one liter capacity 

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

 half a 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 



A B 



FIG. 12. Staining-dishes: A, Stender dish; B, Coplin jar. 



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

 bottles for graded series of alcohols and xylols. 



There should be a graduate, preferably 50 c.c. or 100 c.c. If 

 the bottles are of uniform sizes, 50 c.c., 100 c.c., 500 c.c., and 1,000 c.c., 

 the student should soon be able to estimate with sufficient accuracy 

 for making up reagents which do not require extreme accuracy. 



Three or four pipettes, or medicine-droppers, will be useful. 

 Occasionally, the glass of an ordinary pipette thrust into a small 

 camera bulb will save time in drawing off reagents. 



Slides and covers are a constant expense. Many slides now 

 upon the market are imperfect. Beware of slides which are not 

 perfectly flat. Be skeptical in regard to any claim that slides are 

 already clean enough to use. Of course, there should be no bubbles. 

 "White" slides are to be preferred to those which appear greenish in 



