352 Proceedings of the Royal Society of Edinburgh. [Sess. 
this paper is concerned ; and it is also a sincere pleasure to acknowledge my 
indebtedness to my house physicians, Dr G. A. Gordon, Dr A. I. Shepheard 
Walwyn, and Dr G. Henderson, for their unvarying devotion and untiring 
exertions in assisting me with the investigations upon which it is based. 
The instrument has been constructed by Mr Ednie, of the Physiological 
Laboratory, University of Edinburgh, who has spent much time and great 
ingenuity on overcoming difficulties, for which he deserves my warm 
thanks. 
In a subsequent paper the practical results obtained from the study of 
arterial pressure will be described, and a detailed analysis of the different 
factors involved in it will be attempted. 
LIST OF AUTHORITIES. 
(1) Tigerstedt, Lehrbuch der Physiologie des Kreislaufes, Leipzig, 1893, 
S. 321; Ergebnisse der Physiologie , 1907, vi. Jahrgang, S. 265. 
(2) Hill, Text-book of Physiology , edited by E. A. Schafer, Edinburgh and 
London, 1900, vol. ii. p. 77. 
(3) Vaschide and Lahy, Archives generates de Medecine , 1902, pp. 349, 480, 
and 602. 
(4) Janeway, The Clinical Study of Blood-pressure , New York and London, 
1904, pp. 43, 89, 93; New York University Bidletin of the Medical Sciences , 1901, 
p. 105. 
(5) Hales, Statical Essays , London, 1733, vol. ii. p. 1. 
(6) Poisseuille, Recherches sur la force du coeur aortique, Paris, 1828, p. 23. 
(7) Ludwig, Archiv filr Anatomie, Physiologie , und wissenschaftliche Medicin, 
Leipzig, 1847, S. 261. 
(8) Chauveau and Marey, Memoires de V Academie d& Medecine, Paris, 1863, 
tome xxvi. p. 268. 
(9) Eick, Archiv filr Anatomie und Physiologie, 1864, S. 583. 
(10) Faivre, Gazette Medicate de Paris, 1856, p. 727. 
(11) Vierordt, Die Lehre vom Arterienpuls, 1855, S. 164. 
(12) Marey, La Methode graphique, 1878, p. 610; Travaux de Laboratoire , 
1876, tome ii. p. 316 ; La Circulation du Sang, 1881, p. 179. 
(13) Waldenburg, Berliner klinische W ochenschrift , 1877, S. 17. 
(14) Yon Basch, ibid., 1877, S. 179, 206, 225, 244, and 285. 
(15) Hoorweg, Archiv filr die gesammte Physiologie, 1889, S. 166. 
(16) Potain, Archives de Physiologie, 1890, v. Serie, tome ii. p. 300 and 
p. 681 ; and La Pression arterielle , Paris, 1902, p. 3. 
(17) Hurthle, Archiv filr die gesammte Physiologie, 1890, S. 1 ; 1891, S. 29 
and 104; 1892, S. 281 and 323; 1893, S. 319 ; also Deutsche medizinische Wochen- 
schrift, 1896, S. 574. 
(18) Bloch, Comptes rendus de la Societe de Biologie de Paris, 1888, p. 84. 
