While the preparations for the expedition against Veltopismakus were being carried on Tarzan was left much to his own devices. The activities of these diminutive people were a never ending source of interest to him. He watched the endless lines of slaves struggling with their heavy burdens toward the new dome that was rising with almost miraculous speed, or he strolled to the farmlands just beyond the city where other slaves tilled the rich soil, which they scratched with tiny plows drawn by teams of diadets, the diminutive antelope that was their only beast of burden. Always were the slaves accompanied by armed warriors if they were slaves of the first or second generation, lest they should attempt escape or revolution, as well as a protection against beasts of prey and human enemies, since the slaves were not permitted to bear arms and, consequently, could not protect themselves. These slaves of the first and second generations were always easily recognizable by the vivid green tunic, reaching almost to the knees, which was the single garment of their caste, and which carried upon both its front and back an emblem or character in black that denoted the city of the slave's birth and the individual to whom he now belonged. The slaves employed upon public works all belonged to the king, Adendrohahkis, but in the fields many families were represented by their chattels. Moving about the city upon their various duties were thousands of white-tunicked slaves. They exercised the mounts of their masters, they oversaw much of the more menial and laborious work of the lower caste slaves, they plied their trades and sold their wares in perfect freedom; but like the other slaves they wore but a single garment, together with rough sandals which were common to both classes. On their breasts and backs in red were the emblems of their masters. The second generation slaves of the green tunics had a similar emblem, these having been born in the city and being consequently considered a part of it. There were other, though minor, distinguishing marks upon the tunics of the higher caste slaves; small insignia upon one shoulder or upon both, or upon a sleeve, denoting the occupation of the wearer. Groom, body servant, major domo, cook, hair-dresser, worker in gold and silver, potter--one could tell at a glance the vocation of each--and each belonged, body and soul, to his master, who was compelled to feed and clothe these dependents, the fruits of whose labors belonged exclusively to him.