516 
horizontal, trunk symmetrical to the head (Normal position in the 
curve). 
Left eye 
Poe exh. vab. 
kJ stana| abun uw Sip. | dine Rea Maan en Og war ed 
normal Trunk turned normal position trunk turned normal position 
position to to 
Fig. 2. 
2. After this the trunk was moved as far as possible about its 
dorso-ventral axis, towards the left eye (trunk turned to O.S.). Here 
a distinct contraction of the M. internus and a distinct relaxation 
of the M. externus is noticeable. These new contractions persist as 
long as the trunk is kept in its new position. 
3. Trunk back again in its normal position. This causes a relax- 
ation of the M. internus and a contraction of the M. externus. 
4. Turning of the trunk on a dorso-ventral axis as far as possible 
towards the right eye (Trunk turned to D.O.). Here we observe a 
fresh relaxation of the M. internus and a contraction of the M. 
externus. Here also the tonic nature of the reflex is again distinctly 
noticeable. 
5. Trunk again in normal position; contraction of the M. internus 
and relaxation of the M. externus, so that the muscles are again in 
the state of contraction of the commencement of the experiment. 
About five similar experiments were carried out, with invariably 
the same result. Sometimes the contraction of the muscles was more 
visible than the relaxation. At other times the reverse. Sometimes 
both were equally distinct as in the experiment described. In one 
case only the relaxatien of both muscles could be distinctly made 
out. This of course depends upon the degree of tonicity of the muscles 
at the beginning of the experiment. 
From this we may, therefore, conclude that a reciprocal inner- 
vation of the eye-muscles can also be established for the tonic cervical 
reflexes, but likewise that the tonic nature of the cervical reflexes 
described above, is demonstrable through registration of the contrac- 
tions of antagonistic eye-muscles. 
