This year marks the one hundredth anniversary of the naming of Trichina spiralis by Richard Owen, the material studied having been obtained in the dissecting room by Sir James Paget.1Trichinella spiralis was later suggested as a substitute by zoologists, because the name used by Owen had been applied five years before to a genus of Diptera. The same parasite seems to have been described by Tiedemann2in 1822, and the museum at Guy's Hospital contains a specimen of Trichinella prepared by Peacock in 1828. The anatomist Leidy3of Philadelphia first found trichinellae in pork in the year 1847. Zenker4described clinical trichinosis in 1860. The eosinophilia of trichinosis was observed by T. R. Brown,5then a student at Johns Hopkins, in 1897. Osler6observed the parasites as a student at Trinity in 1868 and he has written that two years later in the