" Sworn and signed before me on the                       day of                                  19            , at                                  , I, having first truly, distinctly, and audibly read over the contents of this affidavit to the deponent (if the deponent is blind or illiterate, add-he being blind or illiterate, as the case may be. If there be exhibits, add-and explained the nature and effect of the exhibits therein referred to), who appeared perfectly to understand the same and made his mark thereto in my presence."