Figure 1(a) shows a low magnification TEM image of the carbon soot from the arc discharge. Granular carbon material and filament-like structures corresponding to carbon nano- tubes are observed. Figure 1(b) shows a higher-resolution TEM image of the carbon nanotubes. The nanotubes in Fig 1(b) have diameters on the order of 5 mm and greater- Figure 1(c) shows a TEM image of nanotubes sticking out of the granular carbon material Figure 2(a) shows a top view STM image of a 1 X 1 Auma area of a carbon nanotube sample prepared as described above on a HOPG substrate. The STM image shows a high contrast between the carbon soot material and the smooth surface of the HOPG. The clumping of the soot material is similar to that observed in the TEM image of Fig. 10a). Fig- ure 20a) reveals the existence, in the region indicated by the arrow, of aligned nanotubes approximately 1 10 14O nm in length. The nanotubes stick out of the carbon soot material in a manner similar to that observed in the TEM images of Figs 1(a) and(c). Therefore, we do not believe these nanotubes are spurious structures from the HoPG substrate. Such spu rious structures have been reported to resemble biological structures such as DNA 12 Figure 20b) shows a higher resolution three-dimensional topographic STM image of the region indicated by the arrow in Fig. 2a). From Fig. 2b