The tonnelett vindicated [electronic resource] : or, some animadversions upon the principles and practice set forth in two tracts, intitled, 1. Traité des eaux minerales de Spa, and 2. Recueil d'observations sur les effets des eaux minerales de Spa, And 2. Recueil d' Observations sur les Effets des Eaux Minerales de Spa, de l' An. 1764, Avec des Remarques sur le Systeme de M. C. Lucas, &c. Par Jean Phillipes de Limbourg, Docteur en Medicine, &c. &c. In Which, The Politeness, Modesty, Candor, Ingenuity, Sense, Knowledge and Judgement of the Author, are shewn in the true Light. In a letter to M. de Vivignis, M. D. Counsiler and Physician to His most Reverend and Serene Highness the Bishop and Prince of Liege, and Physician to the Hospital of St. Abraham, in that City. By C. Lucas, Of the Universities of Rheims, Leyden and Dublin, Doctor of Physic, Member of the Royal College of Physicians of London, and One of the Representatives of the City of Dublin in Parlement.