The _Boak_, or slighter berat, which is not considered to be contagious, still bears the same denomination amongst the Arabs, and is the [Greek: lepra alphos] or dull white leprosy of the Greeks. The bright white and dusky berats of the Hebrews were distinguished on account of their malignity, and with the _Tsorat_ ([Hebrew]) are still called among the Arabians by the Hebrew generic term with a very slight alteration, for the _Berat Lebena_ is their _Beras Bejas_, and the _Berat Cecha_, the _Beras Asved_. While the Arabians borrowed the Hebrew terms, the Greeks took their denominations from the same source; and from _Tsorat_ they adopted the word _Psora_. The _Tsorat_ is restrained by the Hebrews to the contagious form of leprosy. Amongst the Greeks Lepra was a generic synonyme of _Berat_ or _Beras_. This confusion in the adaptation of the names given to the varieties of leprosy has occasioned much perplexity in the study of the disease. Actuarius, in endeavouring to rectify these errors, has produced a greater confusion. According to him, they are different forms of a common genus. However, the most important distinction was that which defined the contagious and the non-contagious forms. The leprosy described by Moses under the name of _Boak_ or _Bohak_ was the [Greek: alphos] of Hippocrates; _Seeth_ the [Greek: phakos]; _Saphachath_ and _Misphachath_ the [Greek: leichen]; and _Bahereth_ the [Greek: leuke]; and according to Carthenser and other writers, this leprosy was the _Leuce_ of the Greeks. The elephantiasis was long confounded with leprosy; but the former is a tubercular affection of the skin, widely different from the scaly leprosy, and certainly not contagious. Its singular name was derived from the condition of the surface of the huge misshapen limbs of those who were affected with the malady, and which bore some resemblance to the leg of an elephant. This morbid state is not uncommon in the island of Barbadoes, and in England it has been called "the Barbadoes leg." The original Arabic name for this affection was _Dal Fil_, or "the elephant's disease," which is now the common denomination; although it is frequently abridged into _Fil_ alone, literally _Elephas_. The elephantiasis is not even alluded to by Moses in his descriptions of leprosy. However, the elephant leg of the Arabians is a disease totally different from the specific elephantiasis, which is a disorder of the skin, the roughness of which led to the name, and which the Arabians called _Juzam_ or _Judam_.