Which of the following methods consists of injecting a few ounces of arterial chemical, then draining for a few minutes, each one separately?

The method described in the question involves a technique where a certain amount of arterial chemical is injected into the body, followed by a separate phase of drainage for a few minutes. This approach allows for the chemical to be distributed effectively throughout the vascular system before fluid is removed, and it is typically employed to ensure that the tissues receive the desired embalming solution while allowing for the removal of blood and other fluids.

This method is known as the alternative method of injection and drainage. It is distinctive because it varies from traditional concurrent or continuous methods by separating the injection and drainage phases, allowing for a precise control over fluid distribution and elimination. This technique can be particularly useful in complex cases or when specific anatomical areas require particular attention.

In contrast, continuous drainage involves simultaneous injection and drainage. Concurrent injection refers to the simultaneous process of injecting fluid while also draining, with no pause. Intermittent injection typically involves a pattern where fluid is injected in a stop-and-start manner, but again does not separate injection and drainage in the distinct phases described in the question. Thus, the alternative method is the correct choice as it accurately describes the process of first injecting the chemical and then conducting a separate drainage period.