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 In Egypt and Rome, therefore, Ricinus was evidently esteemed; and though as a medicine they dropped largely out of use, it is clear from old English physic books that a traditional reputation was always associated with both the seeds and the oil. Gerard, in his "Herbal," and Piso, in an account of the natural history of the West Indies, both recommend them, the former in broth, the latter in the form of a tincture made with brandy for colic and constipation. Gerard states that the Palma Christi "of America" grew in his garden (in Holborn) and in many other gardens likewise. The seeds, however, came to be regarded as dangerous, and were clearly but little used in orthodox medicine. Quincy (1724) refers to them as "hardly ever met with in practice, unless amongst empirics and persons of no credit."

In 1764, however, Dr. Peter Canvane, of Bath, who had practised for seven years in the West Indies, published a treatise entitled "A Dissertation on the Oleum Palmæ Christi, sive Oleum Ricini, or (as it is commonly call'd) Castor Oil," in which he warmly recommended the oil as a gentle purgative, particularly in cases of "dry belly ache." His advocacy soon took effect, for in the second edition of his treatise published in 1769, he says it had become officinal, by which he meant was sold in the shops, "at Apothecaries Hall and several other shops in London and Bath." Dr. Odier, of Geneva, who visited England in 1776, became then acquainted with the medicine, and subsequently brought it to the notice of Continental physicians. It was admitted into the London Pharmacopœia in 1788.

The name "Ricinus" was in Latin the name of the parasite known as the dog-tick, Ixodes ricinus, and was transferred to the Palma Christi seeds because of their resemblance to the insect. In Greek the same insect