The process by which this starch is made is exactly the same as the process by which potato starch is made. The starch is washed out of the macerated raw product by means of water filtration. The cellulose is sieved out and the starch is dried and pulverized. It now becomes the ordinary starch of commerce. The tapioca flour starch which is exported from foreign countries is made by coolie labor from the root of the cassava plant and comes into competition with potato starch. which is made in Minnesota. Michigan. and some 30 other States. In fact. 131 lactories. most of them cooperative. produce 190.000.000 pounds of this starch every year.