practice of any profession for which a license is required by this title, the announcing to the public in any way the intention to practice any such profession, the use of any professional degree or designation, or of any sign, card, circular, device, or advertisement, as a practitioner of any such profession, or as a person skilled in the same, shall be prima-facie evidence of engaging in the practice of such profession. ’ ’
I. Defendant’s first contention is that it is not practicing dentistry. Immediately upon its incorporation, it did open an office in the city of Des Moines, and equipped the same for the purpose of practicing dentistry. Pursuant to the same purpose, it employed licensed dentists for its work. This course of procedure has been followed ever since. It has advertised the practice of dentistry under its corporate name, and not otherwise. It has obeyed the statute in posting the names of its employee-dentists. No officer of the corporation is a licensed dentist. The ownership and control of the entire equipment is in the corporation and its officers, and not in the employees. Its unlicensed officials necessarily determine all its policies, whether they be deemed professional or commercial. If such officials were to carry on this business as individuals, without the formality of a corporate organization and without a license, would they' be amenable to the statutes above quoted, as violators thereof? The affirmative on this question seems too plain to tolerate argument. If these officials could not, as individuals, conduct this business without a license, we can conceive of no reason why they should be permitted to do so, under the statute, under a corporate organization and name. If a business thus conducted by an individual be unlawful, it is likewise unlawful if conducted by a corporation. Code Section 8339. We hold, therefore, that the defendant-corporation was practicing dentistry, and was doing so, therefore, in violation of the statute.
II. Are our foregoing statutes invalid? It is argued that they constitute an unreasonable interference with the natural right of the defendant to do business. It is to be noted that this is not a case where new legislation purports to take away rights that have been acquired and have vested under previous legislation. It is, therefore, not a case of legislative impairment of existing contracts. The appellant lays some stress upon the pro