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...Decidua|Human embryo of 27 pairs of somites]]’ (J. Anat. 1914) — slightly older than Peter Thompson’s 2-5 mm. embryo with 25 pairs — and wrote also on ...ws Prof. Waterston continued his embryological work and published two main papers—‘ Development of the heart in Man’ (Trans. Roy. Soc. Edinb. 1918) and