At the same time Brazil’s export of raw cotton from the Northern States of fine long staple, usually practically all sent to England, diminished until returns for 1915 show only 5,223 tons against over 37,000 tons in 1913 and 30,000 in 1914, but this restriction did not make up the shortage following the drought. The Centro Industrial asked for a governmental enquiry into cotton conditions; in the middle of 1916 the Conference was held in Rio, samples of cotton, etc., displayed, and, after a collection of facts by a _questionnaire_ sent to all weaving mills, expositions of the highest interest were made by officials of the government, technical experts, and cotton growers. Reference is made to this valuable conference under “Cotton,” but the manufacturing notes of these pages may include the name of Miguel Calmon, Chemical Director of the Companhia Industrial do Brasil, popularly known as the “Bangú” factory, who gave an address on the use of native vegetable dyes; optimistic as regards tints drawn from Brazilian forests, Senhor Calmon spoke with appreciation of the “urucú,” a dye producing hues ranging from yellow to deep red, as well as many other better known colouring matters. There is already a very busy dye factory in Minas, the _Fabrica de Tinta Machado_, using native vegetable bases, and much is expected in S. Paulo from dyes made by the use of “Inglotina,” obtained from mangrove leaves: a factory has recently been established at Cubatão. It was at the same conference that Dr. Costa Pinto gave details of the threads spun in Brazil; counting in English measurement, Brazilian mills spin from No. 2 to No. 100 thread. From No. 30 upward a long staple cotton is needed, and only a small proportion of native-grown fibres are suitable, although there is plenty of short fibre for the coarser weaves.