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Correspondence of the 3rd and 4th Earls of Rosse with fellow-astronomers or about the Birr and other observatories, including correspondence of the 5th and 6th Earls about the Birr Observatory, 1840-1909, 1913-14, 1938 and 1964-84.
Journals containing astronomical observations, drawings of nebula, drafts for articles and speeches on astronomy, and other papers (excluding correspondence) of the 3rd and 4th Earls of Rosse on the subject of astronomy, [pre-1828-1908].
Correspondence and other papers of the 4th and 5th Earls of Rosse on subjects other than astronomy, including estate and other King’s County affairs, the 4th Earl’s contributions to public life as a representative peer, Chancellor of T.C.D., etc, etc.
Box containing six miscellaneous letters and papers of or about junior branches of the Parsons family, [all of them probably the children of the Hon. Laurence Parsons, youngest brother of the 3rd Earl – see J/29], including an epitome of the settlement made on the marriage of one of the Hon. Laurence Parsons’s daughters, 1878; together with numerous case papers and court orders concerning the lunacy of the Hon. Laurence Parson’s eldest son, Capt. Laurence Hardress Hector Parsons (d. 1924), 1897-1924.