Copy letter from Michael Foster, to Dr Berry Haycraft, the University, Edinburgh 'My dear Haycraft, I thought it was arranged that in publishing your paper in Zt. für Biol. [Zeitschrift für Biologie] you were to acknowledge at least that the plate was taken from the Proc. Roy. Soc. ['Proceedings of the Royal Society']. I do not in the paper see anywhere any such acknowledgment. I have not compared carefully the paper in Zt. Biol. with that in Proc. Roy. Soc. but I suppose since there is no statement about it, that the one is not a mere reproduction of the other. (signed) M Foster'. 20 August 1891