...He noticed in the two stories that Helen did not go very reluctantly, for she was laughing slyly and roguishly; but the fair Dido was shown dropping tears the size of walnuts from her eyes... 
Miguel de Cervantes 「The History of Don Quixote, Volume II., Complete」
...A similar instance of apparent reasoning is recorded of the same birdby Pliny, but with the substitution of walnuts for oysters...
Rev. C. A. Johns 「British Birds in their Haunts」
...It is asthough a heap of dry walnuts were being shaken up in a bag until theshells broke...
J. H. Fabre Bernard Miall 「Social Life in the Insect World」
..." These are about the size of walnuts, hard and black, and haveto be well soaked before cooking, and then they are not a savoury bite...
Various 「Argentina From A British Point Of View」
...Where arethe walnuts...
Arthur J. Burks 「The Mind Master」
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