... given by printing the words "lower half," et cetera, above the passage, or by giving the initials of these words (sometimes in German). When no bowing is indicated, a phrase beginning with a weak beat commonly has an up-bow for the first tone, while one beginning on a strong beat has a down-bow; but this principle has many exceptions. It is perhaps needless to state that correct phrasing in the case of the stringed instruments depends upon the employment of suitable bowing; and since the first violin part is most prominent and most important in orchestral ... — Essentials in Conducting • Karl Wilson Gehrkens
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