This section is from the book "A Practitioner's Handbook Of Materia Medica And Therapeutics", by Thos. S. Blair. Also available from Amazon: A Practitioner's handbook of Materia Medica and Therapeutics.
Pineapple. The fresh juice contains a digestive ferment known as Bronzelin and acting similarly to caroid. The juice itself is of some value as a local application to the diphtheritic exudate as a solvent.