The plagiarisms of Julius Jeffreys, F.R.S., in his treatise on the statics of the human chest / by G. Calvert Holland.

Date:
1844
Catalogue details

Licence: Public Domain Mark

Credit: The plagiarisms of Julius Jeffreys, F.R.S., in his treatise on the statics of the human chest / by G. Calvert Holland. 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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    and nature of numerous diseases. It will scarcely be doubted, that it is by means of respiration that the blood is oxygenated, and that whenever its properties are vitiated in consequence of the oxygena- tion not being complete, the whole system will be more or less deranged.”* “ If the respiration be accelerated, and the contractions of the heart increased to a hundred, all other conditions being equal, the mass will circulate through the lungs in one-fourth of the time, and the production of animal heat will be augmented in the same proportion/’f Discovery YII —Concerning the invigorating and depressing effects of exercise—He remarks : “ Again, in the case of a person in health commencing a course of severe exercise, we cannot doubt that the loss of flesh is closely connected with the increase of the circulation of the blood, and the consequent increase in the volume of the respired air, and also with the increased production of heat, which corresponds with the other phenomena. “ Lastly, we know that the absorbed matter of the body must, in part at least, pass off in respiration, and by the slrin; and must therefore, to that extent, supply elements available for the produc- tion of heat.”J “ In proportion as the action of all the voluntary muscles ac- celerates the circulation, it multiplies the number of particles travelling the capillaries in a given time. Thus much more action between par-tides must take place, and tlic supply of them is kept up at the same time by the return into the blood of an increased quantity of matter; for the increased flow of blood stimulates the nerves and minute vessels, and amongst them the absorbents, to greater activity. This familiar view affords us a ready and sufficient explanation of the production of heat, and the loss of flesh attending labour, so long as the exertion has the effect of materially accelerating the circulation. As soon, however, as the heart ceases to be excited, and the smaller vessels also bear the pressure of the fluid without increasing their action, the quantity of action throughout all parts of the system diminishes: there is then less laboured respiration, less develop- ment of heat, and a less change of the fabric of the body. Thus * Principles of Medicine, p. 306. f Ibid. p. 310. \ Opus cit. p. .