Remove the cover-slip from the cell by the aid of the forceps.
Place a drop of cedarwood oil on the centre of the cover-slip.
This burns off the remainder of the alcohol, and the cover-slip so "flamed" is now clean, dry, and sterile.
This solidifies at once and seals the block to the cover-slip.
Rest the cover-slip, film side uppermost, on the rubber mat.
A sterile disc of mica may be substituted for the cover-slip.
Boil the mixture and immerse the cover-slip in it, whilst still hot, for one minute.
"Flame" a cover-slip and place it on the filter paper by the side of the hanging-drop slide.
Place the cover-slip, film uppermost, on the rubber mat, and cover it with an inverted watch-glass until dry.
Place a drop of water on the centre of the cover-slip by means of the platinum loop.