by some smaller ones of decreasing size. If we should be at first 
inclined to consider this group of large contractions as the mechanical 
effect corresponding to the quantity A / of the formula, this concep- 
tion offers many difficulties when the mechanical effect assumes a form 
as is represented by the curve which is reproduced by fig. IL. In con- 
sequence of a small increase of concentration we do not see a definite 
effect appear, not even partly defined, but the reflex-apparatus comes 
in rythmical contraction. Where in the first case the resistances in 
the chemical system are such that the oscillations rapidly die away, 
and the new state is reached after a few oscillations, these resistances 
in the second case are so small, that once the equilibrium disturbed, 
the system remains oscillating round its new state of equilibrium. 
This oscillation documents itself as a rythmical mechanical effect. If 
the rate of decay of these oscillations is very small, these rythmiecal 
TABLE I. (Fig. V). TABLE IL (Fig. VI.) 
IN oe (AE OO) Non (250 19 NEON) 
| | Ò Cone. 
: : | | & Conc. 
Cone. pM Gomer al =e 5 Cone, A Conc. | —— 
| Cone. | | Cone. 
0.0><10-° | : 0.0<10-° | ii 
(UES Beg Oia 2650 10 | 
10.1 | 26 6 | 
2.8 b G28 ese 0.158 
12,9 | | SRO 
3.4 | 0.209 P29 0.086 ? 
16.3 | oa) 
4.0 i) *O-4,96 3m 0.085 
20.3 31.7 
| 4.1 0.167 | 2.3 0.058 
M.A | | A) 0 | 
| 4,3 0.150 2.0 0.047 
98.7 / | 12.0 
| 4.9 | 0.447 1.6 0 037 
530 Ì 43 b 
| 4.8 0.123 2.7 0.059 
38.4 | 16.3 | 
10.7 0.218 Pio sD 0.069 
49.1 49.8 | 
| 20.8 | 0.298 Parr’ 0.098 
69.9 55.2 | 
OET 0.155 ‚10.8 | 0.164 
80.6 | 66.0 
| | 19.3 0.226 
85.3 | | 
Section of the medulla 10 A.M. | Oren 
beginning of the experiment 11.15 A.M. 
Temp. 13.5 C, Section of the medulla 10.35 A.M. 
beginning of the experiment 12.40 P.M 
Temp. 13 C. 
nenten ee ees 
