arithmetical progression

Subsequently Poignard constructed squares with numbers in arithmetical progression, having the magical summations.

His play had become wilder and wilder at each hole in arithmetical progression.

The human soul in its desires follows a sort of arithmetical progression, the end and origin of which are equally unknown.

His income increased in arithmetical progression, and his expenditure in geometrical.

The method of summing an infinite series of terms in arithmetical progression was already known.