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Fraser writes: 'Having been engaged since May, 1881, in the investigation of the early placentation in some of the Rodentia, rat, mouse, and guinea-pig, in which it presents peculiar features, I was so fortunate in the commencement of July of the present year to ascertain the fact that in the common grey rat and its white variety, an arrangement of the blastodermic layers existed, similar to that which had been known in the guinea-pig since the publication of Bischoff’s observations in 1852.'

Annotations in pencil and ink throughout. Includes 27 pages of anatomical figures.

Subject: Physiology / Embryology

Received 18 December 1882. Read 21 December 1882. Communicated by William Thomson.

A version of this paper was published in volume 34 of the Proceedings of the Royal Society as 'On the inversion of the blastodermic layers in the rat and mouse'.

Reference number
Earliest possible date
Physical description
Ink and graphite pencil on paper
Page extent
52 pages

Creator name

Alexander Fraser

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Alexander Fraser, Paper, 'On the inversion of the blastodermic layers in the rat and mouse' by Alexander Fraser, 1882, PP/2/40, The Royal Society Archives, London,, accessed on 16 June 2024

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  • Proceedings Papers

    Dates: 1882 - 1894

    The archival collection known as 'Proceedings Papers' is comprised of manuscripts and occasional proofs of scientific papers sent to the Royal Society which were read before meetings of Fellows and printed in full in the Proceedings of the Royal Society.

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