Educational material which illustrates how moss grows.
Title reads: "A British Instructional Film distributed by Pathe Picture Ltd".
Shots of moss growing on walls, on roofs and in the countryside. Microscope shots of a leaf showing its skeleton. Shots of an organism under the microscope. Cells move around in the organism. C/U shot of moss. Time lapse footage of moss growing. Diagram of how the moss grows. More time lapse and shots of organisms under microscope. A flower like organism opens and closes in time lapse making beautiful patterns. Tiny shoots grow through time lapse. Animated graphic. A worm like creature bores its way into an egg shaped thing. Microscope shots of plants. Flower-like entities open and close through time lapse.
Note: this seems to be unedited material. No voice-over or intertitles. Some of the shots have been spliced in upside down. Some shots very dark.