Various questions of law, such as those as to the admissibility of evidence, are constantly arising during the trial, which it is necessary for the trial judge to pass upon. If either party objects to such decisions and desires to have them reviewed by an appellate court, it is necessary for him (in the absence of statutes or court rules changing this rule) to save his rights by taking exceptions to the ruling of the judge at the time they are rendered. The use to which such exceptions are put will be considered in the following chapter.