. The Civil engineer and architect's journal, scientific and railway gazette. Architecture; Civil engineering; Science. L, or Stop. Boarding. R, Rihs. From various instances quoted in the Report it appears that frescos may safely he executed upon lath. The Mortar. — It is not possible to make many observations on the mortar on which mural pictures of the period before referred to are executed, as, fortunately, there are not a great Dumber which are in such a state of dilapidation as to permit a particular examination of th< in in this respect. The majority of these pictures arc
. The Civil engineer and architect's journal, scientific and railway gazette. Architecture; Civil engineering; Science. L, or Stop. Boarding. R, Rihs. From various instances quoted in the Report it appears that frescos may safely he executed upon lath. The Mortar. — It is not possible to make many observations on the mortar on which mural pictures of the period before referred to are executed, as, fortunately, there are not a great Dumber which are in such a state of dilapidation as to permit a particular examination of th< in in this respect. The majority of these pictures arc painted, as is well known, upon an into- naco composed of lime and sand. It is evident that there was a diversity of opinion with regard to the quantity of sand to lime to be used, and the same diversity of opinion exists amongst the modern freacanti. From such examination as it was possible to make, it appears certain that those frescos have stood best in which it is apparent that there is a considerable proportion of Sand in the lime ; and 1 am disposed partly to attribute the bad st ite of the frescos by Correggio in the Duomo of I'arina to bis having used what is called a rich intonaco (that is, with a small proportion of sand), and the faintness of the colours is perhaps to be attributed to the same cause. A number of mural paintings are executed upon an intonaco formed of lime and marble dust; these however arc not frescos but distemper pictures; that is, pictures which, although in many instances commenced in fresco, yet were finished in distemper. Pictures of this description arc also found upon intonacos of lime and sand; and if at first the practice may have arisen from necessity, it appears to have been continued afterwards from choice, even after complete works in pure fresco had been executed. There is nothing to be learnt apparently from old Italian plastering. In point of execution, it is surprising that such careless work could ever satisfy the artists. The V
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