Two pages from The Textile Mercury of April 18, 1891, in the 'Machinery and Appliances' section. They describe Catterall & Co.'s improvement to the pneumatic tubes of 'Exhaust' cotton openers, which adds toothed plates to remove sand, dust and motes, and give test results on waste extracted. They also describe a German moisture-determination apparatus (Dr. O. Knoffer & Co.) that weighs a sample while it dries at 100 C. Short news items on shuttle-guards, a new mill and an obituary, plus the start of installment XII of 'Papers on Bleaching' on warp drying and hank bleaching, complete the pages.