November 1944 – vol. 38, issue 8–120 SIRS,--With reference to t h e note under this heading (antea, p. 53), I found a pair of Ravens breeding in a similar situation in mid-Wales during early April, 1929. The Raven's nest was situated in a tree about 30 yards from a rookery of eighteen nests. A. J. HARTHAN. CHAFFINCH NORMALLY SINGLE-BROODED.SIRS,--Mr. P . R. Cox in his article " A Statistical Investigation into Bird Song " (antea, p . 3)... This article is only available to registered users.To read more, please log in or purchase a subscription.