An essay of health and long life / By George Cheyne.

  • George Cheyne
Date:
1725
Catalogue details

Licence: Public Domain Mark

Credit: An essay of health and long life / By George Cheyne. Source: Wellcome Collection.

    71/302 (page 21)
    Three Principles, viz. Firfi, That the Strength or Weaknefs of Cohefion of f the Particle, of fluid Bodies, depends up¬ on their Bignefs or Smallnefs j that is, the biggefl Particles cohere more firmly, than thz [mailer> becaufe more Parts come into Contact in large Bodies than fmall, and fo their Union is greater. Secondly, That the greater the Force \_Momentunf\ is, with which two Bodies meet, the ftronger is their Cohefion, and the more difficult their Separation. Thirdly, That Salts, being comprehended by plain Sur¬ faces, being hard, and in all Changes recovering their Figure, unite the molt firmly of any Bodies whatfoever: Their plain Surfaces bring many Points into Contact and Union: Their Hardnefs and conftant Figure make them durable and unalterable ; and thereby the active Brin- cipleSy and the Origin of the Qualities of Bodies; and when they approach with¬ in the Sphere of one another's Activity, they firmly unite in CInfers; all which make the Separation of their original Barticles the more difficult. I fay, from thefe three Brinciples, we may in gene¬ ral compare the Eafinefs or Difficulty of digefting (that is, breaking into fmall Parts) the feveral Sorts of Vegetables and