Installment of E. A. Posselt's series on fabric analysis from Posselt's Textile Journal, March 1916, covering identification of animal fibres under the microscope. It describes alpaca, llama, vicugna, guanaco, camel, goat, cow, calf and horse hair, then artificial wools (shoddy, mungo, extract and flocks) with simple tests for shoddy and for flock content. It ends with true silk and wild (tussah) silk, with microscope photographs (Figs. 29-37) of the fibres.