The first part of the chapter analyzes the different paths by which slaves acquired environmental knowledge: importing skills and strategies from equatorial Africa, acquiring knowledge when doing agricultural work in plantations and farms, and maintaining interethnic contacts with Indians. As they learned the ways of local peasants, the enslaved gradually built entire parallel economies with vigorous ties to the expanding network of commercial houses that existed in late nineteenth-century Amazonia. Instead of using the term “internal economy of slavery,” I conceptualize them as an economy that ran parallel to that of their masters, given the size and complexity of the commercial networks in which the slaves participated. The chapter also describes the process of community formation inside the slave quarters at the time of Amazonia’s rubber boom, which had both a positive and negative impact on the prospects of Amazonia’s black slaves. On the one hand, it made it possible for them to expand their parallel economy. On the other hand, that slaves could carry out such a broad scope of activities meant that the slaveowners could adapt to the changes of the era. In Amazonia slavery was just like rubber: flexible and adaptable to multiple conditions – hence its durability.