Although the wrappers appear to list the contents they are occasionally inaccurate; in addition some papers that were published in two parts were explained in the wrappers but there are a few cases where they were not. With the help of a full set of wrappers, the backs of which were sometimes used to complete the text, it is possible to explain all the inconsistencies (except two, one in Vol. 11 and one in Vol. 29).