52G ON Till-: .MAMMALIAN NERVOUS SYSTEM. 



DESCRIPTION OF PLATES 29-35 



Plate 29. Arrangement of an experiment on a Cat for the investigation o" "lectrical 

 changes in the spinal cord consequent upon excitation of the peripheral nerves. 

 See Chapter III. 



Plate 30. Photograph of the encephalon and spinal coi'd of an adult Cat, two-thirds 

 natural size, showing correctly the proportionate size of the various regions of 

 the neural axis. 



The spinal nerves in this and the succeeding Plates are indicated by Roman 



figures and capital letters. 



a, b, c, d are points on the cortex cerebri referred to on page 329. 

 Plate 31. Photograph of the neural axis in a Cat; the same preparation of in 



Plate 30, as arranged for the experiments on bilaterality, &c. 



Plate 32. Photograph of the encephalon and spinal cord of an adult Rhesus Monkey, 

 to show, in comparison with Plate 30. the proportionate size and details of the 

 neural axis in the Monkey as contrasted with the Cat. 

 Plate 33. Photograph of the neural axis in the Monkey ; the same preparation as in 



Plate 32, as arranged for the experiments on bilaterality, &c. 



Plate 34. Photograph of a recent dissection of the lumbar plexus in an adult 

 Monkey, showing the arrangement of the roots entering the plexus. 

 A.c. = Anterior crural nerve. 

 Ob. = Obturator nerve. 

 E.P. = External popliteal. 

 T.P. = Internal popliteal. 

 Hs. == Branches to hamstring muscles. 

 An. Branches to anal and putlic plexuses. 



= Filum terminals. 



Plate 35. Photograph of a recent dissection of the lumbar plexus in an adult Cat. 

 Lettering as in Plate 34. 



S.s. = Small sciatic. 



