The affidavit should have stated that copies of the petition and notice Avere directed to the respondent “ at his usual place of residence ” It is not sufficient to prove that they were sent to a particular post office, without showing that this office Avas.at such place of residence of respondent. Code, sec. 1826, Carr v. Kopp, 3 Iowa 80.

Eor this error the cause must be reversed and remanded.