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big, for instance if the numbers are more than twice the number of the alphabet Arabic numerals are used. Regarding these big collections, the original numbers in the collection itself, like in Cod.Or. 6662 (L.C. Westenenk coll., pp. 343, 351), are maintained. If the numbers of more than one MS are considered as separate numbers, like Cod.Or. 3195 and 3195 a, this numbering is maintained. To avoid misinterpretations the numbering of MSS in big collections already described in previous catalogues, is followed by the numbering in existing catalogues.