M. VITALIS, (in his work on Dyeing published in 1823) has given, at length, the _mode of dyeing Turkey red at Rouen_. It differs in many particulars from Berthollet and others. We learn from him that two systems for imparting this colour are in use at Rouen. The first is called the _grey course_ from the cotton being subjected to the maddering immediately after it has received the oily preparations, and the mordants of galls and alum which give it a _grey_ colour. The _yellow course_, is so called from the cotton, after having received a first time the oily preparations, as well as the mordants of galls and alum, _not_ being exposed to the maddering till it has passed a second time through the same preparations, and the same mordants which give it _a yellow_ colour. This second manner of working the Turkey red is called, in the dye-house, _remounting on the galls_. Dr. URE, in a note to Berthollet, vol. ii. p. 378, has detailed these two courses, and made, besides many valuable observations on them, and the dyeing of Adrianople red generally, for which we must refer to the work, as our limits prevent the possibility of any further notice of them here, except to add, that a _process for dyeing cotton of a smoke red_; and another for _dyeing cotton a cherry red_, is well deserving the attention of the dyer. In regard to the _blood_ used in dyeing Adrianople red, Dr. Ure decidedly affirms, that "_it adds no colouring matter to the madder in the dyeing operation_;" in this he is countenanced by the observations of Chaptal, see Berthollet, vol. ii. p. 141. "To the use of blood in the madder copper," says Dr. Ure, "I attribute nothing, as from the rancid and putrid state in which I have seen it used, were it not for the prejudice of the operator, it might be safely dispensed with." A very eminent calico manufacturer, whom Dr. Ure consulted, assured him, that in the Turkey red process the only essential mordants were oil and alumina; and that bright and fast reds, equal to any produced by the complicated processes of sheep's dung, galls and blood may be obtained without those articles. We make no comments on these observations, but leave them to the good sense and intelligence of the dyer: they deserve the utmost attention. _Linen yarn_ takes a colour almost as brilliant as that of cotton, but it must be passed through a double number of oils and leys. The latter must even be very strong, otherwise the oil flows out at the surface. The greatest attention must be bestowed on the scouring out first: for the yarn mingles and entangles by the heat to such a degree, that it sometimes can be neither dipped nor unravelled.