Copy of letter, from Sir John Herschel to Wilhelm Struve Copy of letter, copied as part of the correspondence project led by Colonel John Herschel FRS following the death of his father. Mortified at Punch cartoon libeling Wilhelm Struve's sovereign. Enjoyed Wilhelm Struve's visit and invites Otto Struve again. Request Wilhelm Struve to give [G. B.] Airy his 'full impressions' of Munich glass as opposed to British glass. Supports British glass for Cape's colonial instruments. 18 June 1844