"Van Helmont adds a... criticism to the Paracelsian theory. The tria prima play no role in disease, as they cannot be …"

"Tria Prima. The three elements of the alchemists, their salt, sulphur, and mercury: the first of which appears to hav…"

"Alchemical theory was essentially static throughout the medieval period. ...Paracelsus was the herald of a new era, a…"

"Since a great part of those Learned Men, especially Physicians who have discerned the defects of the vulgar Philosoph…"

"Now a man need not be very conversant in the writings of Chymists to observe, in how Laxe, Indefinite, and almost Arb…"

"And first the Doctrine that all their Theory is grounded on, seems to me Inevident and undemonstrated, not to say pre…"

"It is somewhat strange to me, that neither the Spagyrists themselves, nor yet their Adversaries, should have taken no…"

"But I will not... trouble you with what I have largely discoursed in the Sceptical Chymist, to call in question the g…"

"The doctrine of the four elements seems to have continued undisputed till the time of the alchemists. These men, bett…"

"At a still later date [post-16th century] it was argued that exact and natural sciences proceed by induction and dedu…"