Letter from Alan Sterling Parkes, on two papers 'Elephantulus going into anoestrus; menstruation and abortion' by C J van der Horst; and 'The lactation cycle of elephantulus myurus jamesoni (Chubb)' by Muriel J McKerrow, to D C Martin Paper reference code: B23 and B24 Parkes comments both papers have been greatly improved by revisions which meets most of his earlier criticisms, and recommends the papers to be published in the Philosophical Transactions. Written at Medical Research Council, National Institute for Medical Research, The Ridgeway, Mill Hill, London [England]. [Both papers published in Philosophical Transactions B, 1954]. Endorsed on recto as received 25 March 1954. 24 March 1954