16 
METHODS IN PLANT HISTOLOGY 
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 
Fig. 14.—Coil of brass wire holding 15 slides 
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. 
