In the process of comparing linguistic meaning-forms of languages which have proved to be related, one may find a small number of attractive comparisons exhibiting a correspondence which, if divided, would be subsumable under other already established correspondences. To account for this type of correspondence the comparatist may treat it (1) as resulting from a special condition within the proto-language, either the existence of a hitherto unidentified phoneme or cluster, or the existence of proto-doublets (i.e. synonymous and nearly homonymous meaning-forms), or (2) as appearing because of changes within the daughter languages other than phonetic change: analogy, or borrowing from another dialect or from a related language. The second alternative cannot be a solution for a hitherto unassigned correspondence found in a set of otherwise systematic comparisons (1) if the correspondence is found in a position not subject to the effects of analogy and (2) if two or more languages exhibit respectively the same (or identifiable) unanticipated correspondents in each case. Borrowing in great quantity from other dialects or from related languages might produce such an effect if only one language were concerned, but it is hardly likely to do so in two languages independently.