Letter from [Schack August Steenberg] Krogh to the Secretary of The Royal Society [Archibald Vivian Hill], regarding a paper 'Nature and causes of adaption of water-breathing creatures to air-breathing. I - the binomics, structure and physiology of an air-breathing Indian loach, Lepidocephalus (= syn Lepidocephalichthys) guntea (Ham, Buch) obtained from H E H the Nizam's dominions' by B K Das Paper reference code: B.35 Has been in correspondence with Das concerning his paper, and is willing to consider it again 'in the light of additional information given' by the author. Krogh requires a copy of the paper and his original report in order to do this. If the Royal Society no longer has a copy of the paper, he would like the Society to check if Professor [ Ernest William] MacBride has one. The author promised to send him a rough copy but this has not appeared and may have been lost. [Not published]. Received 7 July 1939 6 July 1939