clii Journal of Comparative Neurology. 



tension at the hip, (2) flexion at the knee, (3) dorsi-flexion at the 

 ankle, (5) eversion of the foot, (6) extension of the digits, (7) flex- 

 ion of the digits, (8) flexion of the hallux, (9) extension of the 

 hallux. 



The 7th lumbar caused extension at the hip, flexion at the knee, 

 with the plantar surface of foot looking inwards, flexion of the digits 

 at their metacarpo-phalangeal joints, flexion of the hallux and its ad- 

 duction into the sole of the foot beneath the flexed digits. 



The several fascicles reacted as follows : (i) extension at hip, 

 (2) flexion at knee, (3) extension at ankle, (4) flexion of digits, (5) 

 flexion of hallux, (6) adduction of hallux. The ist sacral produces 

 interossal flexion of the digits with flexion and adduction of the hal- 

 lux and three parts were isolated, each having one of the functions 

 named. 



The muscles were exposed during life and the nervous connec- 

 tion established directly, as follows: 2d iiimbar, ■p'soa.'s, magnus ; j^ 

 lumbar, psoas parvus, psoas magnus, sartorius ; ^.th lumbar, psoas 

 magnus, iliacus, sartorius, adductor longus, quadriceps extensor, gra- 

 cilis; ^th lumbar, iliacus, gluteus minimus, adductor magnus, adduc- 

 tor longus, quadriceps extensor, gracilis, tibialis anticus, tibialis post- 

 icus, extensor long, digitorum, flexor long, digit., peroneous longus, 

 p. brevis, ext. long, hallucis, gluteus medius, pyriformis, obturator 

 externus, o. internus, gemellus superior, g. inferior, quadratus femor- 

 is, propliteus, plantaris ; jth lumbar, hamstrings, gastrocnemius, 

 soleus, flexor long, digitorum, pemneus longus, p. brevis, flexor long, 

 hallucis, adductor hallucis, interossei, and the last ten of the list un- 

 der the 6th lumbar ; i sacral, intrinsic muscles of the foot. 



The author concludes that a single bundle of nerve fibres, repre- 

 senting a single simple movement may remam distinct during its 

 course to the muscle it supplies, without inosculation with other motor 

 nerve fibres, and that where more than one nerve supplies a given 

 muscle, any given muscle fibre is suppled from but one nerve. 



The advantage of the anastomoses of the nerve fibres is shown 

 by the observation that the section of no single nerve root was suffi- 

 cient to produce a visible alteration in the climbing or running move- 

 ment. * 



The paper closes with a comparison with the results of the exper- 

 iments of Sherrington, and Ferrier and Yeo. 



A New Hypothesis Concerning- Vision. 



In the Proc. Roy. Soc, Vol. LIV, No. 827, Dr. Haycraft 

 offers a new theory of color vision based on evolutionary data. He 



