. Animal and vegetable physiology considered with reference to natural theology. Natural theology; Physiology; Plant physiology; Biology. 64 THE MErHANICAL FUNCTIONS. The membrane constituting tlie tube is sometimes simple, like those of the simple cells: but it fre- 12 13. 15 16 1/. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Roget, Peter Mark, 1779-1869. London : W. Pickering

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