As a general rule, interest cannot be recovered on unliquidated demands.28 This old common law rule, however, has been modified to some extent and under later decisions even though the amount of damages be unliquidated, yet if it can be ascertained by computation and reference to established market values, interest may be recoverable thereon.29

28 Brownell Imp. Co. vs. Critchfield, 197 I11.,61,64 N.E., 332; Speer vs. Vanorden, 3 N. J. L., 652.

29 Mansfield vs. New York Cent., etc., R. Co., 114 N. Y., 331, 21 N. E., 735: Fitch vs. Livingston, 4 Sandf., 492.