He wrote also for the Encyclopædia Britannica, and the Transactions of the Royal Society of Edinburgh.
His daughter Penelope married in 1959 Norman Frank Butler, eldest son of Paul Butler of Oak Brook, Illinois, and grandson of Frank O. Butler, also of Oak Brook (J.W. Butler Paper Mills, Chicago).
In 1959 he married his second wife Penelope Dewar, daughter of Lord Forteviot, owner of Dewar Whiskies in Scotland.
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