Such a measure of prudence, activity, or assiduity, as is properly to be expected from, and ordinarily exercised by, a reasonable and prudent man under the particular circumstances; not measured by any absolute standard, but depending on the relative facts of the special case. Perry v. Cedar Falls, 87 Iowa, 315, 54 N. W. 225; Dillman v. Nadelhoffer, 1G0111. 121, 43 N. E. 378; Hendricks v. W. U. Tel. Co., 120 N. C. 304, 35 S. E. 543, 78Am. St. Rep. 058; Highland Ditch Co. v. Mumford. 5 Colo. 330.