Chapter IV 



The Motion of the Heart and its Auricles as 

 Noted in Animal Experimentation 



IN ADDITION to the motions of the heart already- 

 considered, those of the auricles are also to be 

 discussed. 



It has been reported by two skilled anatomists, 

 Caspar Bauhin {lib. 2, cap. 21) and John Riolan^ 

 {lib. S, cap. /), that if the motions of the heart of 

 a living animal are carefully watched, four move- 

 ments distinct in time and place are to be seen, of 

 which two belong to the auricles and two to the 

 ventricles. In spite of these authorities, there are 



^ Caspar Bauhin (i 560-1 624) wasProfessorof Botany and Anatomy 

 in Basle. His Theatrum Anatomicum (1605) is an unoriginal but re- 

 liable text. John Riolan (i 577-1 657) was generally regarded as the 

 leading anatomist of his day. As Professor of Anatomy and Pharmacy, 

 and Dean of the Medical Faculty of the University of Paris, he was 

 an extremely influential conservative. On the basis of fairly reasonable 

 arguments, he opposed Harvey's views on the circulation in his 

 Encheiridium Anatomicum (1648), and Opuscula Anatomica Nova 

 (1649). This was the only criticism against which Harvey deigned to 

 reply, in his Exercitationes duae anatomicae de circulatione sanguinis ad 

 Jo. Riolanum (1649). These are available in the beautiful English of 

 Robert Willis' 1847 translations of Harvey's works for the Sydenham 

 Society. For an admirable account of Riolan's views, see J. C. Dalton's 

 scholarly Doctrines of the Circulation, Phila., 1884. Riolan's book, to 

 which Harvey probably refers here, is his Anthropographia (161 8). 



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