Part 1 of a technical article by M. Luedtke of Berlin on the microscopic structure of vegetable fiber cells, drawing mainly on bamboo and bleached straw fibers. It covers transverse (annular) elements that cause bead-like swelling in cuprammonium solution, the layered structure of the cell wall, spiral lamellae, fibrils, and the binding material between them. The author argues that thin membranes similar to the cuticle separate the layers and lamellae and give the fiber strength. It includes micrographs, a labeled sketch of fiber structure and extensive footnotes citing botanical literature; it ends with "To be continued".

Concluding part of M. Luedtke's two-part article on the cell structure of vegetable fibers, focusing on chemical constitution. It describes extracting and separating the hemicelluloses (mannans, xylans) from cell-wall pulp with caustic soda and copper-ammonia solutions, and a proposed direct method for determining cellulose. It also covers the phloroglucin-hydrochloric acid color reaction used to identify the primary layer, with a table comparing bamboo, straw, wood, bast fibers and cotton. It closes with a summary of fiber structure (primary, secondary and tertiary lamellae, spirals, fibrils, lumen), illustrated by micrographs of bamboo and straw fibers and a labeled sketch.