Summary

Robert H. Jackson Sartor v. Arkansas Natural Gas Corporation…

In considering the testimony of expert witnesses as to the value of gas leases, this Court through Mr. Justice Cardozo has said: 'If they have any probative effect, it is that of expressions of opinion by men familiar with the gas business and its opportunities for profit. But plainly opinions thus offered, even if entitled to some weight, have no such conclusive force that there is error of law in refusing to follow them. This is true of opinion evidence generally, whether addressed to a jury * * * or to a judge * * * or to a statutory board.' Dayton Power & Light Co.
Source: Wikisource

Robert H. Jackson Sartor v. Arkansas Natural Gas Corporation…

There are many things sometimes in the conduct of a witness upon the stand, and sometimes in the mode in which his answers are drawn from him through the questioning of counsel, by which a jury are to be guided in determining the weight and credibility of his testimony. That part of every case, such as the one at bar, belongs to the jury, who are presumed to be fitted for it by their natural intelligence and their practical knowledge of men and the ways of men
Source: Wikisource

Robert H. Jackson Sartor v. Arkansas Natural Gas Corporation…

The only evidence in support of defendant's contention as to the wellhead market price is opinion testimony of experts.
2. Each of them either is an officer of the defendant or is a lessee, or is an employee or officer of a lessee corporation, engaged like defendant in gas production, and each certainly is open to inquiry as to the truth of plaintiffs' attorney's sworn statements that each has interest in or bias as to the subject matter of this litigation.
Source: Wikisource

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