PRIMARY INHIBITION OF CILIARY MOVEMENT All 
of 10/35 sec. = 17 per minute. The animal’s mouth begins to 
be more open than normally. 
6h.4m. The ciliary waves now die away before they have 
reached the oral end of the row. A number of waves do not tra- 
verse more than a quarter of the length of the row. No row is 
drawn in. 
6h.8m. The tubular electrodes are immersed. Temperature 
in the cuvette 19.4°. 
6h.11m. The ciliary activity without any current is the same 
as at 6h.4m. When a longitudinal oro-central current is closed 
there is no inhibition with a density of current 1.13 m.amp./em.?; 
6h. 15 m. nor with a density of 1.47 m.amp./em.?. 
6h. 16m. If the density of the current is 2m.amp./em.? the 
ciliary activity is accelerated. 
6h.17m. Thesame result with a density of 2.47 m.amp./cm.?. 
There is now no inhibitory reflex when the edges of the mouth 
are touched. 
6h. 19 m. A current of 2.93 m.amp./cem.? accelerates the 
ciliary movements, where there still are any. The animal has 
sunk to the bottom of the cuvette. 
6h. 23m. A current of 3.47 m.amp./em.? produces no inhibi- 
tion in the rows that still strike in their aboral part. The animal 
is put back in the aquarium again: it is flaccid and its mouth 
remains wide open. 
20/7. The same animal now has a normal ciliary activity 
and moves along the bottom of the aquarium. 
5. Beroé, 14 mm. in length, stays at the bottom of the aqua- 
rium and there takes up a vertical position. If the animal is 
placed in a horizontal position it corrects it to a vertical one in 
a short while by inhibition of the ciliary movements in the lower 
rows. During this change of position the frequency of the upper 
rows seems, as far as the eye can judge, to be about the same as it 
is in all the rows in the vertical position. 
31/7. 12h.44m. The animal is transferred to a cuvette con- 
taining sea-water with 1.5 per cent of chloral hydrate. Tem- 
perature, 16.9°. | 
