City of Cedarburg Light & Water Commission v. Allis-Chalmers Manufacturing Co.

(on rehearing).

Our statement in the original opinion “it is not essential to have expert testimony on the issue of causation” is too broad and not universally true. There may be cases where the issue of causation, like the issue of negligence, involves technical, scientific or medical matters which are beyond the common knowledge or experience of jurors and without the aid of expert testimony the jury could only speculate as to what inferences to draw if it were left to determine the issue. The lack of expert testimony in such cases results in an insufficiency of proof. See *568bKreyer v.…