Worden, J., of the Supreme Court of Indiana, in considering the question, in a case that came up prior to the statute above referred to, reviewed most of the American decisions and the opinions of the text writers, and concluded “that physicians and surgeons, whose opinions are valuable to them as a source of their income and livelihood, cannot be compelled to perform service by giving such opinions in a court of justice without payment.” The Court further said, “It would seem, on general principles, that the knowledge and learning of a physician should be regarded as his property, which ought not to be extorted from him in the form of opinions without just compensation.” “If the professional services of a lawyer cannot be required in a civil or criminal case without compensation, how can the professional services of a physician be thus required? Is not his medical knowledge his capital stock? Are his professional services more at the mercy of the public than the services of a lawyer? When a physician testifies as an expert by giving his opinion, he is performing a strictly |29| professional service. * * * The position of a medical witness testifying as an expert is much more like that of a lawyer than that of an ordinary witness testifying to facts. The purpose of this service is not to prove facts in the cause, but to aid the Court or Jury in arriving at a proper conclusion from facts otherwise proved” [57]. In an earlier case (in 1854), in Massachusetts, the Court said, “to compel a person to attend because he is accomplished in a particular science, art or profession, would subject the same individual to be called upon in every case in which any question in his department of knowledge is to be solved. Thus, the most eminent physician might be compelled, merely for the ordinary witness fees, to attend from the remotest part of the district, and give his opinion in every trial in which a medical question should arise. This is so unreasonable that nothing but necessity can justify it” [58].