The _Derniers Travaux_ has the merit of bringing prominently forward the “hypothesis of Hasse,” advanced in 1803 and presently forgotten. It would explain the purity of the Gypsy tongue by the fact of these tinklers being settled in Europe _ab antiquo_. It has often been remarked that the farther we go eastward, and the nearer we approach the cradle of the race, Sindh or Western India, the more completely the language changes and degrades. This is to be expected. The Jats living in close contact with other dialects would necessarily modify their own after the fashion of their neighbours; such is the rule of the world. The Romá have only two ties: one is of blood, the love of “kith, kin, and consequence”; the other is of language which serves to conceal his speech. During the dispersion of centuries the Gypsies, surrounded by alien and hostile races, would religiously adhere to the old tongue; and having a vital interest in preserving a secret instrument, it would war against change. It is the more necessary to insist upon this view, as our critic expects to find after a separation of some four centuries the Jats or other tribes speaking pure old Gypsy. The modern Gypsy may still represent the ancient Játaki. Hence also the dialect of their ancestors is dying out amongst the sedentary Romá. M. Paul Bataillard has carefully separated, and perhaps too curiously, the historical arrival of the Gypsies in Western Europe and their establishment in the south-eastern regions, Thrace, Dacia, etc. An abuse of his theory makes him urge the identity of his _Tsigane_ with the mysterious Sicani who held Sicily before the Siculi. These and other prehistoric identifications have not yet been generally adopted.