The _Ko ku yao lun_, which was written about sixty years later than the publication of the Memoirs of Chiang, supplements this information in a short paragraph on "Old Jao Chou wares." "Of the Yüan wares," it says,[358] "those with small foot and moulded ornament (_yin hua_), and the specimens inscribed inside with the characters _shu fu_[359] are highly valued. The recently made wares with large foot and plain white (_su_) glaze are wanting in brilliancy (_jun_). There are also green (_ch´ing_) wares and those with enamelled (_wu sê_)[360] ornament, and they are very common. Of the modern (i.e. beginning of the Ming dynasty) wares good specimens with white colour and lustrous material are very highly valued. There are besides dark green[361] wares with gilt ornament. They are chiefly wine pots and wine cups, which are very lovely." The _T´ao lu_ has a paragraph on the _shu fu_ wares which reflects (not always very clearly) these earlier accounts, adding that "this is the ware made in the private (_min_) factories and supplied to the palace; the material had to be fine, white and unctuous clay, and thin specimens were preferred.... Inside them were written the characters _shu fu_ as a mark. At the time the private factories also issued imitations of these wares; but of the porcelains destined for the Emperor ten out of a thousand, one out of a hundred, only were selected. The private factories were unable to achieve uniform success." The author has inserted the gilt and enamelled,[362] and a large number of the other wares mentioned in the Memoirs of Chiang and the _Ko ku yao lun_ in that irresponsible fashion which makes much of the Chinese ceramic literature exceedingly difficult to handle. Indeed, one is tempted to ask what was his authority for the statement that the "private factories" made the _shu fu_ ware, in spite of the very circumstantial tone of the passage.