Although this journal is more particularly destined to contain the results of taxonomical and geographical studies, it may sometimes provide accomodation for subjects of a different, though kindred nature. The more so, when an item is concerned, which is, in some way or another, closely allied to the editing institution. The apparently long-forgotten XVth Century MS., rediscovered in the library of the Rijksherbarium, is therefore a worthy subject for a series of papers under the general title proposed above. It has been carefully transponed into modern type, as may appear from the quotations given. Both the entire rewritten MS. and the original may be consulted in the Rijksherbarium and I avail myself of this opportunity to request the interest and, if possible, the cooperation of anyone, who may know something to solve the problem of its origin.