156 PHOTO-MICROGRAPHS. 
temperature — blood-heat — may be seen, as the 
result of this active vibration of its cilia, to swim 
about like a unicellular organism. 
The cell seen in the figure is from the back part 
of the mouth of a frog. Specimens are readily 
obtained from this situation by scraping the sur- 
face with a dull knife. These ciliated epithelium 
cells are not shed so freely as the “ pavement” or 
“ tessellated ’ epithelium ; but at the outset of a 
sharp attack of nasal catarrh, they may be found 
in the watery fluid discharged from the nostrils. 
Some years since, some of these ciliated epi- 
thelium cells found in the discharge from the nos- 
trils of persons suffering from “summer catarrh,” 
or “ hay fever,” led to the announcement that the 
cause of this trouble had been discovered, and 
that it was due to the presence of parasitic organ- 
isms. These organisms were described and figured; 
but the discoverer has not been heard from since 
the learned Professor Leidy pointed out the fact 
that they were nothing else than the ciliated 
epithelium cells found upon the bronchial and 
nasal mucous membranes of healthy persons. 
Scaues oF Insects. (PuatTe IV. Fies. 38, 4, anp 5.) 
If a little of the dust which adheres to the fin- 
gers after handling a moth or a butterfly (Le- 
pidoptera) be placed under the microscope, it 
will be seen to present the appearance seen in 
Plate IV. Figs. 3, 4, and 5. 
These scales are often very beautiful objects, 
