What is the test for proving cause in a medical malpractice case?

These words seem quite appropriate to our present Public Health Law. The defendant held himself out as a doctor, able to cure laryngitis. He had an office where his name appeared, as though he were a duly licensed physician. The plaintiff could not tell whether or not the doctor was licensed according to the Health Law; she was not obliged to look up the records before going to him; nor was she expected to understand all the requirements of the regents. She was one of that public which the law sought to protect by declaring that the so-called doctor was forbidden to do the very thing he did do, and which resulted in injury. Proximate cause in connection with the violation of a city ordinance was before the court in Monroe v. Hartford Street Ry. Co., 56 A. 498, 76 Conn. 201. The court said: