is that degree of care which men of common prudence generally exercise in their affairs, in the country and the age in which they live. Erie Bank v. Smith. 3 Brewst. (Pa.) 9: Zell v. Dunkle. 150 Pa.353, 27 Atl. 38: Railroad Co. v. Scott. 42 111. 143; Briggs v. Taylor. 28 Vt. 184 ;Railroad Co. v. Fisher, 49 Kan. 400. 30 Fac. 402: Railroad Co. v. Mitchell, 92 Ga. 77, 18 S. E. 290.