204 PHYSIOLOGY CHAP. 



show the existence of a centre for abdominal compression, closely 

 connected with the former, in which no one has yet succeeded. 



Another fact worth noting, which may serve as a point of 

 departure for further work, is that observed by Ducceschi after 

 section of the vagi and caeliac plexus, as performed on dogs under 

 Fano's directions. While on section of the vagi there is, according 

 to Ducceschi, no very striking modification in the form and course 

 of the normal movements of the stomach, excision of the caeliac 

 plexus, which sends branches into the stomach in connection with 

 Auerbach's plexus, sets up movements with a periodic course, 

 which arise from the grouping and combination of rhythmical 

 movements, peristaltic waves, and oscillations of tonus, constituted 

 into successive groups of fairly regular form (Figs. 70 and 71). 

 This phenomenon (which recalls the analogous effect already 

 studied on the heart and in the respiratory movements) is never 

 seen under normal conditions. Subsequent division of the vagi 

 modifies the groups, without, however, suppressing them. 



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 Early Literature in general : 



REAUMUR. Memoires de 1'Academie des sciences, 1752. 



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TIEDEMANN and GMELIN. Die Verdauting nach Versuchen. Heidelberg und 

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Mechanism and Innervation of Deglutition : 



MAGENDIE. Precis elem. de physiologic. Paris, 1816. 



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