This practice of earmarking certain sources of income may be illustrated from almost any monastic chartulary, for it was common for benefactors to earmark donations of land and rent to certain special purposes, more especially for the clothing of the nuns, for the support of the infirmary, or for a special pittance from the kitchen[366]. Similarly bishops appropriating churches to monastic houses sometimes set aside the proceeds for special purposes[367]. The result of the practice was that the obedientiaries of certain departments, more especially the cellaress, chambress and sacrist, had to keep careful accounts of their receipts and expenditure, which were submitted annually to the treasuress, when she was making up her big account. Very few separate obedientiaries' accounts survive for nunneries, partly because the majority were small and the treasuress not infrequently acted as cellaress and did the general catering herself. Cellaresses' accounts, however, survive for Syon and Barking, chambresses' accounts for Syon and St Michael's Stamford (the latter merely recording the payment to the nuns of their allowances) and sacrists' accounts for Syon and Elstow[368]. In one column these accounts set out the sources from which the office derives its income. This might come to the obedientiary in one of two ways, either directly from the churches, manors or rents appropriated to her, or by the hands of the treasuress, who received and paid her the rents due to her office, or if no revenues were appropriated to it, allocated her a lump sum out of the general revenues of the house. Thus at Syon the cellaress drew her income from the sale of hides, oxhides and fleeces (from slaughtered animals and sheep at the farm), the sale of wood, and the profits of a dairy farm at Isleworth, while the chambress simply answered for a sum of L10 paid to her by the treasuresses. In another column the obedientiary would enter her expenditure. This might take two forms. According to the Benedictine rule and to the rule of the newly founded and strict Brigittine house of Syon, all clothes and food were provided for the nuns by the chambress and cellaress; and accordingly their accounts contain a complete picture of the communal housekeeping. In the later middle ages, however, it became the almost universal custom to pay the nuns a money allowance instead of clothing, a practice which deprived the office of chambress of nearly all its duties and possibly accounts for the rarity of chambresses' account rolls. The Syon chambress' account is an example of the first or regular method; the St Michael's, Stamford, account of the second. More rarely the nuns received money allowances for a portion of their food. The growth of this custom of paying money allowances will be described in a later chapter[369]; here it will suffice to consider the housekeeping of a nunnery in which that business was entirely in the hands of the chambress and cellaress.