Through the loop of a cord hanging near to the “boião” the form is passed and sustained by the “seringueiro” who gives it a gyratory movement; with the “cuya” or gourd, he pours the latex into the part scooped out of the spatula, which he carries off immediately to the smoke. The latex thickens and forming a thin skin upon the which another coating of latex is poured out, which is also passed to the smoke. Those successive and alternate operations form the skins, large balls of rubber, weighing from 20 to 60 kilos, which are the type exported from Brazil. The smoke acting as a solidifyer and at the same time a disinfectant by the presence of creosote, acetic acid, etc., kills all the bacteria that produce putrefaction and hastens by its heat the evaporation of the water. The rubber thus formed is of a superior quality, but when, however, the curds still deposited in the basin, are incorporated with it, the quality becomes damaged, being then quoted as medium fine. The portion of milk which remains adhering to the receptacle or which surrounds the boião and which thickens freely, is reunited into one single skin, and constitutes the “sernamby.” On the following day the work recommences, the seringueiro making new incisions about 7 centimetres below the first, and continuing thus until he reaches the ground. To that series of blows in the vertical sense, 35 on the average, is given the name arreação. In each seringueira 2 of these arreações can be made per year. That process which with small variations is employed in all Amazonia, produces, as is known, the best rubber in the world. A seringal may contain in accordance with its size from 40 to 800 roads. Each seringueiro exploits 2 roads; in which he works alternatively. The daily gathering varies between 2 and 8 litres of milk, but an average of 5 litres can be taken for a road which contains 120 seringueiras of 35 centimetres diametre. As each arreação has 35 incisions and the seringueiras supporting 2 “arreações,” we have thus for each road 70 days or 140 days for the 2 roads; 700 litres of milk produce 400 kilos or in other words 1.666 grammes per tree. There are “seringaes,” however, in which that average is considerably greater, a medium of 3 kilos per tree not being an exaggeration in some rivers. Contrary to the almost sedentary life of the seringueiros, the extractors of the caucho (known as caucheiros) are of nomadic habits, and this is so by reason of the barbarous process employed in the exploitation of those trees which is a ruinous one.