the owners of the premises and represented a total loss to plaintiff. Thus, a total of $23,712.50 was realized from all of the equipment.
Plaintiff claims the market value of the property upon resale was $87,800. The trial judge found the property would have brought $87,800 at auction but that plaintiff had failed to mitigate properly its damages upon the resale of the presses because it had failed to store and sell them when the opportunity was presented. Therefore, he deducted $30,000 from the difference between $87,800 and $23,712.50, which resulted in a judgment for plaintiff of $34,087.50 plus certain minor adjustments which are not in substantial dispute.
Defendant first contends plaintiff failed to sustain its burden of proof that defendant’s failure to mail the brochures to the correct parties was a cause in fact of the sale’s lack of success because plaintiff failed to produce evidence of any potential buyer who would have purchased equipment had he been given notice of the sale. If a plaintiff is held to the kind of proof of cause in fact of the failure of a sale which defendant claims is necessary, it would be virtually impossible for one in plaintiff’s position ever to prove a case; however, the law does not require such exactitude of proof. Defendant argues that cause in fact of damages was not proved with reasonable certainty as required by Parker v. Harris Pine Mills, Inc., 206 Or 187, 206, 291 P2d 709, 56 ALR2d 382 (1955). What is actually meant by "reasonable certainty” is discussed in McCormick, Damages 100, § 27 (1935), in which it is stated,
« [i]t appears that the epithet 'certainty’* is over-strong, and that the standard is a qualified one, of 'reasonable certainty’ merely, or, in other words, of 'probability.’ ”
Plaintiff introduced evidence that the number of persons who registered for its sales were in a fairly constant proportion to the number of brochures which