857. 1
V:
1. No. 857 is missing. Nevertheless we find three references to it, in nos. 550, 858 and 870, and because both nos. 550 and 858 include as well a reference to no. 856, and no. 858 in the text comes immediately after 856, it seems quite likely that no. 857 was omitted accidentally by the printer of the first edition.
