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Freshwater algae: 1) Organisms in a drop of water, d) Tree-branched thread algae, de) Desmidiaceae, di) Diatoms, eu) Euglena, g) Bell animalcule (Vorticellidae), i) Free-swimming infusoria, o) Swinging threads, r) Wheel animal (Rotifera), sp) Spirotaenia obscura, u) Ulothrix, z) Zygnema; 2) Spirotaenia obscura, a and b) Formation of the yoke spores, c) Germinating spore; 3) Monocellular algae; 4) Thread algae with star-shaped leaf green structures; 5) Snow algae (Watermelon snow), b) Swarm spores; 6) Oedogonium, a) Part of thread, b) Hatched spore, c) Germinating spore; 7 a - c) Development of swarm spores of yellow-green algae Vaucheria. Chromotypogravure, published in 1894.