The forces which carry on the circulation of the blood / by Andrew Buchanan.

Date:
1874
Catalogue details

Licence: Public Domain Mark

Credit: The forces which carry on the circulation of the blood / by Andrew Buchanan. Source: Wellcome Collection.

Provider: This material has been provided by the Royal College of Physicians of Edinburgh. The original may be consulted at the Royal College of Physicians of Edinburgh.

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    VIU CONTENTS PART III THE PNEUMATIC FORCES Section I.—General Principles on which the Action of Pnewnatic Forces depends FAQE Incredulity of Bi-itisli physiologists . . . . .31 Hostility of Dr Arnott ...... 31 His general objection to all forms of pneumatic agency . 33 Fallacy of his reasoning . . . . . .33 Physical conditions under -which pneumatic forces are available with flaccescent tubes . . . . .35 (1) Must be merely auxiliary to a propulsive force' . . 35 (2) Can never communicate a greater momentum than that given by the propulsive force . . . .35 (3) If no excess of momentum any amount of pneumatic force available . . . . . .36 Apparatus illustrative of the operation of pneumatic forces on flaccescent tubes, and of the advantage derived from them 37 Section II.—Pneumatic Forces in Human Body considered individually Pneumatic force of chest . . . . . .43 Dr Arnott's bloodless experiment to disprove it . .44 Two parts of chest essential to its pneumatic action . . 45 Pulmonary and circumpulmonary cavities . . .45 Simple typical apparatus, with two corresponding divisions . 46 Air-sac and water-chamber . . . • .46 Air-sac acting alone . . . • • .46 Respiratoi-y pump ....... 47 Destitute of valves, draws in liquid but does not expel it , 47 Action of, depends on elasticity, weight, and position of mem- brane of air-sac . . . • • .47 Provisions of nature to augment elasticity . . .48 Varieties of action . . . ■ • • .49 Liquid coming from a lower level . . ■ .49 In vertical tube of uniform area . . . • .50 In tube wider above than belo w .... 52 Liquid coming from same or higher level . • .54 Analogy of the chest to the respiratory pump in structui-e and mode of action . . • • • .55 Diagrams and working model . . • • .56 Pneumatic force of heart and of artei-ies • • • .58 Elastic force of heart probably seated in basis of ventricle . 59 Mode of action of the auriculo-ventricular valve . . 60 Pleuro-cardiac pneumatic force . • • • .62