The long diary-letters which he had written to her day by day, and which had reached her at such irregular intervals, were not in any obvious sense love-letters.
"Jane Oglander"
Marie Belloc Lowndes
At frequent intervals her thin little voice resounded: "He is searching about with his trunk!"
"In Desert and Wilderness"
Henryk Sienkiewicz
It is written, too, at different intervals, and in different moods of mind.
"The Martins Of Cro' Martin, Vol. II (of II)"
Charles James Lever