. Animal and vegetable physiology considered with reference to natural theology. Natural theology; Physiology; Plant physiology; Biology. .324 THE VITAL FUNCTIONS. rated, and variously reunited in their course, like a ravelled skein of thread, before they proceed to their respective Thus the ganglionic, or excito-motory system of Dr. M. Hall, furnish points of union between ner- vous fibres belonging to various organs, which are often situated very remotely from one another; and these uniting parts may be regarded as so many separate centres of nervous power: the functions of th
. Animal and vegetable physiology considered with reference to natural theology. Natural theology; Physiology; Plant physiology; Biology. .324 THE VITAL FUNCTIONS. rated, and variously reunited in their course, like a ravelled skein of thread, before they proceed to their respective Thus the ganglionic, or excito-motory system of Dr. M. Hall, furnish points of union between ner- vous fibres belonging to various organs, which are often situated very remotely from one another; and these uniting parts may be regarded as so many separate centres of nervous power: the functions of this system being, first, to serve as the channels through which the affections of one organ may be enabled to influence a distant organ ; and secondly, to be the medium through which the powers of several parts may be combined and concentrated for effecting particular purposes, requiring such co-operation. Hence it is by means of this system that all the organs and all the functions are ren- dered efficient in the production of a common ob- ject, and are brought into one comprehensive and harmonious system of operation.* The nervous power, the efl'ects of which we are * We shall afterwards find that the greater part of the nervous systems of invertebrate animals execute functions of this description : not only the movements of the vital organs, but also many of those of the external instruments of motion being perfoi-med apparently without sensation or 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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