“ Undoubtedly, also, until the Court of Appeals acted, the trial court was not the court of last resort of the state whose action could be here reviewed. The contention, therefore, that the judgment of the trial court was a final judgment susceptible of being here reviewed by writ of error must rest upon the impossible assumption that the finality of that judgment existed before the happening of the cause by which alone finality could be attributed to it. ”

“ There is no room for such exception unless it results from the provision in the statute taking out of the reach of its terms judgments rendered before it became operative. The act was approved on September 6, 1916, and was made operative 30 days thereafter. ”