It might be partly owing to the studied austerity of her dress, and partly to the lack of demonstration in her manners.

This "proper cause" clause is understood to allow the issuing authority discretion to deny permits based on lack of demonstration by the applicant of such cause.

I was initially tempted, in a mood of cynicism, to put this lack of demonstration down to the deference to authority which helped create our national crisis in the first place.

Adams LA, Angulo P. Vitamins E and C for the treatment of NASH: duplication of results but lack of demonstration of efficacy.