126 
THOMPSON YATES LABORATORIES REPORT 
Ilnd Post-thoracic Root. — Curving of body, as above ; flexion of hip ; draw^ing up of cremaster ; 
very occasionally flexion of hallux. 
1st Post-thoracic Root. — Muscles of flank contract ; some retraction of abdominal w^all low down ; 
flexion of hip. 
Xllth Thoracic Root. — Muscles of flank and abdomen contract ; flexion of hip, but not regularly 
or in all individuals. 
Xlth Thoracic Root. — Muscles of flank and abdomen, and intercostal space, w^ith stimuli of 
moderate strength, never any movement in limb in any experiment. 
Vllth Thoracic Root. — Muscles of back and side of chest ; some of superficial more readily 
than the intercostals. The intercostals most readily caused to contract are those of 
the 7th and 8th spaces, and after them in 6th space. It is almost impossible to evoke 
contraction in the crossed intercostals ; no movement in limbs. 
Vth Thoracic Root. — Muscles of back and side of chest, intercostal spaces chiefly involved are 
of 5 th and 6th spaces; no movement in limb except occasional retraction of shoulder. 
IVth Thoracic Root. — Retraction of shoulder ; dilatation of pupil confined, or almost so, to the 
eye on the side stimulated ; occasionally contraction of part of triceps. 
Ilird Thoracic Root. — Retraction of shoulder ; contraction in part of triceps occasionally well 
marked ; occasionally flexion and adduction of thumb, with less commonly slight 
flexion of other digits ; dilatation of same side pupil. 
Ilnd Thoracic Root. — Movement in shoulder ; slight flexion of thumb and digits ; sometimes 
contraction in part of triceps. [Dilatation of pupil of same side. — July, 1897, C.S.S.] 
1st Thoracic Root. — Movement of shoulder, certainly retraction sometimes, with contraction in 
part of triceps ; adduction and flexion of thumb and flexion of other digits ; extension 
of elbow, sometimes flexion of elbow ; less easily slight flexion, and some pronation, 
of the wrist. This root on being examined in three (anterior, middle, and posterior) 
sets of filaments elicited the same replies from each of the sets, except that flexion of 
the elbow was less unfrequent from the anterior than from the posterior. 
Vlllth Cervical Root. — Adduction and flexion of thumb, flexion of other digits, flexion, more 
often extension, of wrist, sometimes with drawing to ulnar side ; drawing in and down 
of shoulder, retraction of upper arm, with occasional contraction in part of triceps 
going from humerus to scapula. At elbow rarely extension, sometimes flexion ; 
during the former movement the triceps was seen to act, during the latter movement 
the supinator longus, but the biceps very little. When the examination was con- 
ducted on the root in three divisions, extension and triceps action were less common 
from the anterior than from the posterior, supinator longus action and flexion more 
common from the anterior than from the posterior. 
Vllth Cervical Root. — Adduction and flexion of thumb and flexion of other digits ; flexion of 
elbow, retraction of shoulder. By examination of this root in three sets of filaments, 
the reply obtained from the lowest was frequently flexion of digits, followed by 
flexion of elbow, while reply from anterior set was frequently flexion of elbow 
