But in English blank verse you can translate quite as literally as you could into prose?
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I doubt it, but even so, the rhythm of the blank line would carry your mind away from that of the original.
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But if you don't know the original?
The rhythm of the original can be suggested in prose judiciously used; even if it isn't, your mind is at least free, whereas the English rhythm must destroy the sensation of something foreign. There is no translation except a word-for-word translation. Baudelaire's translation of Poe, and Hugo's translation of Shakespeare, are marvellous in this respect; a pun or joke that is untranslatable is explained in a note.
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But that is the way young ladies translate—word for word!
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No; 'tis just what they don't do; they think they are translating word for word, but they aren't. All the proper names, no matter how unpronounceable, must be rigidly adhered to; you must never transpose versts into kilometres, or roubles into francs;—I don't know what a verst is or what a rouble is, but when I see the words I am in Russia. Every proverb must be rendered literally, even if it doesn't make very good sense; if it doesn't make sense at all, it must be explained in a note. For example, there is a proverb in German: "Quand le cheval est sellé il faut le monter;" in French there is a proverb: "Quand le vin est tiré il faut le boire." Well, a translator who would translate quand le cheval, etc., by quand le vin, etc., is an ass, and does not know his business. In translation, only a strictly classical language should be used; no word of slang, or even word of modern origin should be employed; the translator's aim should be never to dissipate the illusion of an exotic. If I were translating the "Assommoir" into English, I should strive after a strong, flexible, but colourless language, something—what shall I say?—a sort of a modern Addison.