He was Swiney lecturer on geology at the British Museum .
McNab was appointed to the chair of botany in the Royal College of Science , Dublin March 1872 ( - 89 ) , and then scientific superintendent of the Royal Botanic Gardens , Glasnevin , Dublin .
McNab was Swiney McNab on geology at the British Museum .
McNab was appointed to the chair of botany in the Royal College of Science , Dublin March 1872 ( - 89 ) , and then scientific superintendent of the Royal Botanic Gardens , Glasnevin , Dublin .