THE MIcROscoPE. 27 
placing a drop at the edge of the cover-glass. Diluted with 
water, aniline red will tinge the cilia without causing their mo- 
tiontocease. (Anilinered=Fuchin,1centigramme. Absolute 
Alcohol, 20—25 drops. Water, 15 cubic centimeters.) The 
action of cilia may be strikingly shown by examining the gills 
of a living oyster or of a clam. 
The particle of mucus removed from the frog’s mouth may 
be gently torn to pieces with needles, when many cells will be- 
come free and the motion and power of the cilia seen to good 
advantage. 
Electrical currents, heat, and any fluid currents all acceler- 
ate the motion of the cilia. Carbonic acid first accelerates, 
then checks, and finally arrests their motion. When the motion 
has just ceased slightly alkaline fluids will 
apparently call it to life again for a short 
time. When the vapor of chloroform is 
brought into contact with the cilia while 
in vigorous motion the movement will be- 
mY Reels / come gradually slower and slower and 
Ciliated Epithelium from 
trachea of acat. x 450. eventually stop. If now fresh air be al- 
lowed to displace the vapor of the chloroform the cilia will re- 
vive and become as active as ever. 
PAVEMENT EPITHELIUM. 
Pavement epithelium, known also as squamous or buccal 
epithelium is obtained by placing a drop of the saliva on the 
slide. The preparation is allowed to rest, without covering, for 
Saliva. A, Epithelial cells. B, Salivary corpuscles. x 400, 
a moment in order that the large number of air bubbles present 
may rise to the surface, when they may be removed by passing 
