526. Description of the _Digitalis Purpurea_, or Foxglove, 419 527. Active Principles of the Foxglove--The Digitalins, 419 528. Digitalein, 420 529. Digitonin--Digitogenin, 420 530. Digitalin, 420 531. Digitaletin, 420 532. Digitoxin--Toxiresin, 420, 421 533. Digitaleretin--Paradigitaletin, 421 534. Other Active Principles in Digitalis; such as Digitin, Digitalacrin, Digitalein, &c., 421, 422 535. Reactions of the Digitalins, 422 536. Pharmaceutical Preparations of Digitalin, 422 537. Fatal Dose, 422-424 538. Statistics of Poisoning by Digitalis, 424 539. Effects on Man--Illustrative Cases, 424-427 540. Physiological Action of the Digitalins, 427 541. Local Action of the Digitalins, 427, 428 542. Action on the Heart and Circulation, 428, 429 543. Action of the Digitalins on the Muco-Intestinal Tract and other Organs, 429 544. Action of Digitalin on the Common Blow-Fly, 429 545. Action of the Digitalins on the Frog’s Heart, 429, 430 546. _Post-mortem_ Appearances, 430 547. Separation of the Digitalins from Animal Tissues, &c.--Tests, Chemical and Physiological, 431 II. OTHER POISONOUS GLUCOSIDES ACTING ON THE HEART. 1. _Crystallisable Glucosides._ 548. Antiarin--Chemical Properties, 432 549. Effects of Antiarin, 432 550. Separation of Antiarin, 432 551. The Active Principles of the Hellebores--Helleborin-- Helleborein--Helleboretin, 433 552. Symptoms of Poisoning by Hellebore, 433 553. Euonymin, 433 554. Thevetin, 434 2. _Substances partly Crystallisable, but which are not Glucosides._ 555. Strophantin, 434 556. Apocynin, 434 3. _Non-Crystallisable Glucosides almost Insoluble in Water._