1897 THE MICROSCOPE. 123 
This probosis may be in the center of the mass of cilia 
as at 15 or 16, or at the side, asat 14 and 17. Itmay be 
drawn in, leaving a nipple-like elevation, as at 10, or it 
may disappear entirely, leaving the organism oval, as at 
8, or spherical, as at 6. 
The proboscis often only partially disappears, or is 
partially drawn in, while a constriction occurs in the 
form, as represented at 13 and 14. It may be simply a 
largely dilated cilium, as at 17 and 18, or the cell walls 
may go out, forming a more or less sharp protuberance, 
as at 15; or the walls may go still farther out, forming a 
more or less fusiform organism, as at 16. 
The young are developed within the parent cell, and 
when mature are discharged at the end of the organism 
opposite the cilia,as seen at figure 18. The parent becomes 
quite dilated before delivering, and as the voung one is 
discharged the parent cell becomes shrunken and 
shriveled for a time. The aperture, however, soon closes; 
the wrinkled, shriveled condition of the walls disappears, 
and the parasite moves about again, fresh, plump and 
as lively as ever. 
The cilia are in active motion during the greater part 
of the life-existence of the parasite, and produce a most 
‘ ageravating irritation of the mucous surfaces. The 
young organisms—1, 2, 3, 4,5 and 6— have a rolling, 
rocking, vibrating motion from side to side, making about 
one third of a revolution on the transverse axis at each 
oscillation. The more mature cells either vibrate 
slightly or have a tremulous motion, the cilia not moving 
altogether as at 5, but vibrating in different directions. 
After once obtaining a foothold on the mucous surfaces 
of the air passages, they multiply rapidly. At first they 
attack the mucous surfaces of the eye and nose, causing 
free secretion of tears and thin mucus, and oftenintense 
paroxysms of sneezing. 
The organisms gradually travel from the nasal surfaces 
