None. The text is based on two typed transcripts prepared for Albert Bigelow Paine, each of which is likely to derive independently from the original letter, which has not been found. Tr1 was clearly made and corrected from the MS because it contains a holograph correction in Paine’s hand. Tr2 seems to be a fair copy (with carbon copy) of Tr1, but like other duplicate copies of Paine typescripts, it too was probably made with access to the original. The variants between them do not demonstrate their independence, but that independence is here assumed on the basis of dozens of other duplicate typescripts prepared for Paine which are in fact independent, or partly independent, copies of the original.