Ad Augustam Societatem Regiam Angliae The letter is in Latin. Notes on the first page state that this is no 381 (this may refer to the number of an English translation), that this is a letter from [Philipp Jacob] Hartman[n], that it dates from 1697, that it was entered in L[etter] B[ook] [volume] 12 [page] 30 and that it appears in [Philosophical] Trans[actions] no 238. On the last page of the letter it is dated 15 September 1697. There is an appendix entitled 'Historia; et explicatio figurarum, Embryon quatuor sephmanarum, et placentam cotyledoniformem exhibentium'. This relates to the development of the embryo and placenta at four weeks. There are four loose pages with diagrams. 1697