. Animal and vegetable physiology, considered with reference to natural theology, by Peter Mark Roget ... Biology; Physiology; Plant physiology; Natural theology. CIRCULATION IN THE ARACHNIDA. 249. tica, or house spider, with some of the arte- rial trunks arising from it, lying imbedded in a thick mass of substance, having a similar oily character to that which is con- tained in large quantities in the principal cavities of insects- It is, in general, difficult to ob- tain a view of the circulation in the living spider, on account of the thick covering of hair which is spread over the body and
. Animal and vegetable physiology, considered with reference to natural theology, by Peter Mark Roget ... Biology; Physiology; Plant physiology; Natural theology. CIRCULATION IN THE ARACHNIDA. 249. tica, or house spider, with some of the arte- rial trunks arising from it, lying imbedded in a thick mass of substance, having a similar oily character to that which is con- tained in large quantities in the principal cavities of insects- It is, in general, difficult to ob- tain a view of the circulation in the living spider, on account of the thick covering of hair which is spread over the body and the limbs; but if a species, which has no hair, be selected for examination, we can see very distinctly, through the microscope, the motion of the blood in the vessels, by means of the globules it contains, both in the legs and in other parts, where it presents appearances very similar to those already described in the limbs of the larvae of insects. A complete vascular circulation is established in all the animals which compose the class of Annelida; the vessels being continuous through- out, and having sufficient power to propel the blood through the whole of its circuit. Great variety exists in the arrangement and distribu- tion of these vessels, depending on the form of the animal, the complication of its functions, and the extent of its powers. The first rudi- ment of a distinct system of circulating vessels, independent of the ramified tubes proceeding. 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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Keywords: ., bookcentury18, booksubjectnaturaltheology, booksubjectphysiology
