192 
DR. F. SEMOX AXD MR. V. HORSLEY OH AH INVESTIGATION 
laryngeal paralysis had existed so long that atrophy ought necessarily have followed, 
we cannot admit this case as actually proving such a relationship as that claimed by 
the autlior. 
Finally, at this moment a paper on the subject is in course of publication from the 
pen of ScHEFF,''" the outcome of which cannot yet be foretold. 
The general observations of LannoisI bring nothing new, whilst Gottstein| con¬ 
siders the question of the existence of a cortical centre for the larynx in man as still 
open. 
This short list practically exhausts the clinical material in connection with the 
subject. 
c. Methods of Ex-perimentation. 
The different points to be considered under this heading may conveniently be 
grouped in the following manner :— 
1. Electrical methods. 
2. Operative technique. 
1. Elect viced methods .—The excitation either of the cortex, corona radiata, or bulb 
was furnished by the secondary coil of a DU Bois-Reymond inductorium of the 
ordinary pattern, the distances of the secondary coil being marked in millimetres from 
a zero point where the primary coil was completely covered. In the later experiments 
we always employed a special inductorium with the Helmholtz side wire, very kindly 
graduated for one of us by Professor Kronecker, according to the manner he has 
published elsewhere, and by means of which alone is obtained an accurate knowledge 
of the increase in the strength of the stimulus when the secondary coil is pushed 
towards and over the primary. To facilitate the various references to the strength of 
the current in this paper we now give in parallel columns the divisions in millimetres 
according to the old method, and opposite them the divisions according to Kronecker’s 
method. The battery elements employed were either one Daniell cell, one 1 litre 
bichromate cell, (Grenet), or a thermoelectric element, 16 cm. high, 14 cm. diameter, 
of 19 metallic j unctions. 
Du Bois-Retmond 
inductorium. 
cm. 0. 
1. 
2. 
3. 
4. 
5. 
6. 
7. 
8. 
9. 
ro 
o 
o 
o 
o 
o 
o 
o 
o 
o 
Divisions of 1 3 
o 
lO 
o 
o 
03^ 
03 
iO 
05 
o 
iO 
o 
co^ 
o 
co^ 
o 
CO 
current 1 co 
of 
of 
r-H 
o' 
oT 
go' 
inT 
o' 
jo' 
f-H 
1-^ 
Kroneckee inductorium. 
10. 11.12. 1.3.14. 15. 16.17. 18.19. 20. 21. 22. 23. 24. 25 
o o o o 
o o o o 
CO CO ^ IN* 
co'' of ^ 
O 
o 
o 
OOOOOOr^OOOOOr-t 
OOIOXOOOCOOOJ^^O^'^ 
^ CO OI I 1-H 
a 
.2 u 
2 > 
The electrodes employed were always fine platinum points which, in exciting the 
cortex, were fixed 2 mm. apart, but in exciting the corona radiata, internal capsule, or 
* “ Zur Pathologic d. Motilitatsstorungen d. Kehlkopfs.” ‘ Allg. Wien. Med. Zeitung,’ .lane, 1890. 
t “ Y a-t-il un Centre cortical du Larynx ? ” ‘ Revue de Medecine et de Chirurgie,’ August, 1885. 
J ‘ Die Krankheiten des Kehlkopfs,’ Dritte Auflage, 1890, p. 344. 
