Final answer:
The question relates to microscopy techniques, where stains or dyes are applied to specimens to highlight features not visible in diagrams, and supplementary details are provided alongside the drawings. A scale is used for size reference, and delicate handling is required to prevent specimen damage.
Step-by-step explanation:
The subject of the question pertains to the practices used in microscopy for visualizing and recording information about specimens that are not readily apparent or visible in the diagram. When observing specimens under a microscope, scientists use various techniques to enhance the visibility of certain structures. One common method is to apply stains or dyes to the specimen, which can highlight specific features or elements of the specimen, such as the nucleus or flagella.
It is often necessary to note details about the specimen alongside the drawing, such as the color a structure was stained or the presence of elements like flagella, which may not be visible in the diagram due to limitations in staining or resolution. Further, it is important to carefully handle specimens, especially delicate structures like flagella, to avoid damaging them. Adding a scale to the image, for example, using a coin or ruler, can provide a reference for the size of the observed objects. In some cases, such as with phase-contrast microscopy, specimens can be observed without staining to view live cells and their organelles.