Sentence:  House servants are usually either Chinese or Tamil, the former predominating, especially in towns of any size. The domestic staff will in general consist of a houseboy (in large establishments two houseboys), a water carrier ("tukang ayer"), whose duties include washing dishes and preparing baths, a cook, a gardener, a chauffeur or <WSD>"sais</WSD>", and perhaps an "ayah" (if Chinese, "amah") or two, according to the size of the family. 
Meaning of the word marked with <WSD> tags:  "usually" '''syce''': chauffeur, driver.