509.170. In pleading the performance or occurrence ofconditions precedent, it is sufficient to aver generally that allconditions precedent have been performed or have occurred. Adenial of performance or occurrence shall be made specificallyand with particularity, and when so made, the party pleading theperformance or occurrence shall establish on the trial the factsshowing such performance or occurrence.
(L. 1943 p. 353 ยง 48)