To embroider is to work on something: a groundwork is presupposed. And we usually understand by embroidery, needlework in thread (it may be wool, cotton, linen, silk, gold, no matter what) upon a textile material, no matter what. In short, it is the decoration of a material woven in thread by means still of thread. It is thus the consistent way of ornamenting stuff—most consistent of all when one kind of thread is employed throughout, as in the case of linen upon linen, silk upon silk. The enrichment may, however, rightly be, and oftenest is, perhaps, in a material nobler than the stuff enriched, in silk upon linen, in wool upon cotton, in gold upon velvet. The advisability of working upon a precious stuff in thread less precious is open to question. It does not seem to have been satisfactorily done; but if it were only the background that was worked, and the pattern were so schemed as almost to cover it, so that, in fact, very little of the more beautiful texture was sacrificed, and you had still a sumptuous pattern on a less attractive background—why not? But then it would be because you wanted that less precious texture there. The excuse of economy would scarcely hold good.