418 GUSTAF FR. GOTHLIN 
4h. 50 m.-5 h. Total stoppages lasting a second or two are 
still observed. The animal does not show anything at all 
remarkable. 
5h.1m. The animal is removed to a cuvette containing sea- 
water with an admixture of atropin sulphate in the proportion 
of 32: 100,000. 
5h.5m. The waves are regular; on a couple of rows it was 
impossible to count them. 
5h.7m.5h. 17m. The rows are generally somewhat drawn 
in. The animal begins to show occasional contractions of the 
body, especially at the sensory pole, which are accompanied by 
secondary stoppages of the ciliary apparatus. To mechanical 
irritation, even at the edges of the mouth, the animal reacts 
exceedingly easily with contractions of the smooth musculature. 
5h. 23m. Electrodes having been introduced, a longitudinal 
oro-central current is tested. If such a current of density 2.33 
m.amp./em.? is closed the swimming plates stop and remain sta- 
tionary, although the retraction of the rows is rather slight. 
The effect is immediate and the moment after the current is 
broken regular ciliary waves begin to break forth. 
5h. 35m. The ciliary activity is now violent in most of the 
rows, but the animal does not move from the spot. No spontan- 
eous total stoppages can any longer be seen. ‘The synchroniza- 
tion of pairs of the rows is disturbed. 
6h.42m. After the rheonome has been inserted so that one 
is able to alter the strength of the current uniformly, it is 
observed that when the density of the current is slowly raised from 
0 to 0.67 m.amp./em.? no alteration is perceptible in the ciliary 
activity; with the increase of the current from 0.67 to 2.13 
m.amp./em.? the ciliary activity only becomes still wilder than 
before. 
When the density of the current is still further increased no 
primary inhibition is observed, but with a current of density 
2.67 m.amp./em.? a contraction of the animal suddenly takes 
place, with secondary inhibition of the ciliary apparatus. 
6 h. 50 m. The same procedure as before is repeated, with 
the same result, except that the contractions and secondary inhi- 
bition occur now at 2.40 m.amp./cem. 
