986 MESSES, A. WALLEK AND A. DE WATTEYILLE ON THE INFLUENCE 
Description of Tracings. 
(N.B.— All Tracings, except Tracing 25, are to be read from right to left. The cylinder 
speed is about 2 centims. per minute.) 
Tracings 1-7. Series of kathodie closure contractions with different strength and 
rhythm of current. 13,000 ohms in circuit. 
Strer 
igth. 
Duration 
of flow. 
Duration 
of interval, 
Cells. 
m.w. 
Tracing 1. 
75 
4 -j 
fist part 
3" 
1" 
1 
L 2nd part 
1" 
3" 
Tracing 2. 
150 
"1st part 
1 " 
3" 
1 
- 2nd part 
3" 
1" 
Tracing 3. 
150 
9 
3" 
1 " 
Tracing 4. 
75 
4 
V f 
3" 
Tracing 5. 
75 
4 
2" 
2" 
Tracing 6. 
150 
9 
2" 
2" 
Tracing 7. 
75 
4 
2" 
2" 
In support of the argument that descending series indicate that make 
excitation occurs during the diminished excitability consequent on previous 
make, ascending series that it occurs during the increased excitability con¬ 
sequent on previous make, we may refer to Tracings 1 and 2, in which the 
rhythm was reversed in the course of each series. The comparison of 
Tracings 6 and 7 shows, we believe, that the period of diminution is longer 
with the weaker than with the stronger current. Tracing 4 as compared 
with Tracing 5 shows diminution of the descent by prolonging the interval 
and shortening the duration of flow; we suppose that the make excitation 
in the former case does not, as in the latter, coincide in time with a state of 
diminished excitability. 
Tracing 3 as compared with Tracing 6 shows diminution of the ascent by 
shortening the interval and prolonging the duration of current; we suppose 
that in the former case, as compared with the latter, the make excitation 
falls within a period of diminished excitability. 
Tracings 8-14 show the effect of the induction, current modified by a galvanic current 
in the same circuit; without additional resistance. 
Tracing 8. Break induction kathodie contractions before, during, and after passage of 
