72 SCIENCE PROGRESS. 



generation of the preganglionic segment has been brought 

 about by section of the lumbar nerves/ 



With regard to the question of the presence of a second 

 set of fibres in the sacral nerves, Langley and Anderson 

 are not able to confirm the observations of previous workers 

 that such exist. They obtained negative results on stimu- 

 lating the sacral nerves, and were, moreover, led to the 

 same conclusion, as a result of the tracino- of deofenerated 

 fibres following section of the sacral nerves.' 



The vaso-vioto7' nerves to these parts take the same 

 course as the fibres to the muscular walls. Stimulation of 

 the efficient nerves causes, in addition to the previously 

 mentioned effects, marked pallor of uterus, vagina, and 

 vestibule in the female, and of the vas and seminal vesicles 

 in the male. They have the same course and similar nerve- 

 stations as the viscero-motor fibres. 



NERVES TO SWEAT GLANDS. 



Langley,^ working upon the sweat glands in the pads of 

 the cat's feet, describes the origin of the fibres for the fore 

 feet to lie in the fourth to tenth thoracic inclusive. They 

 mainly run in the sixth, seventh, and eighth thoracic anterior 

 roots, to a less extent in the fifth and ninth, still less in the 

 fourth, and only occasionally in the tenth thoracic. xA.ll these 

 fibres run upwards, and end in cells in the ganglion stellatum. 

 From this they issue in the grey rami to the nerves of the 

 brachial plexus, and thence to their distribution. The com- 

 bined sixth and seventh white rami supply chiefly the inner 

 part of the foot. 



For the hind foot they leave the cord in the first and 

 second lumbar, to a rather less extent in the thirteenth 

 thoracic, and still fewer in the twelfth thoracic and third 

 lumbar ; and when the lumbo-sacral plexus is posterior in 

 the fourth lumbar. None of these fibres leave the sym- 

 pathetic cord above the sixth lumbar ganglion or below 



"^ Journ. of Phys., vol. xviii., p. 177, 1894; vol. xix., p. 372, 1896. 

 ^ Ibid., vol. xix., p. 372, 1896. 



^ Ilnd., vol. xii., p. 347, 1891 ; vol. xvii., p. 296, 1S94-5. A full 

 account of the earlier literature is given in this paper. 



