...On fine sunny days in February it begins to add to its simple calla more musical sound, approaching a whistle... 
Rev. C. A. Johns 「British Birds in their Haunts」
... Just when his heart was growingsick within him, his straining ear caught the faintest, most timid calla lover ever answered...
Gene Stratton-Porter 「The Song of the Cardinal」
...In common parlance we still calla pouch or pocket by that name, whether it is full or empty...
Ernst Haeckel 「The Evolution of Man」
...From the moment that a childis conceived, it is subjected to what it is now the fashion to calla "geographic control...
Robert Marett 「Anthropology」
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