L1 is a slide of a stained transverse section through a plant organ. [Figure 2.1] is a diagram of a stage micrometer scale that is being used to calibrate an eyepiece graticule. One division, on either the stage micrometer scale or the eyepiece graticule, is the distance between two adjacent lines. The length of one division on this stage micrometer is 0.1 mm. 0 10 20 30 40 50 60 70 80 90 100 stage micrometer eyepiece graticule [Figure 2.1] [Figure 2.2] is a photomicrograph of a stained transverse section of the same plant organ as the section on L1 but from a different plant. This was taken using the same microscope and eyepiece graticule as in [Figure 2.1]. The eyepiece graticule scale has been placed across one of the larger sections of vascular tissue, labelled T in [Figure 2.2]. T. D 0 10 20 30 40 50 60 70 80 90 100 [Figure 2.2] [Figure 2.3] is the same photomicrograph as that shown in [Figure 2.2]. D [Figure 2.3]