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acid air-bladder animal animalcule aperture appear arrangement attached body bone bone-cells branches branchial calcareous Canada balsam capillaries cavity cells cellular centre character cilia colour composed cytoblasts decay described diameter direction disk elongated examination exhibit EXPLANATION OF PLATE external extremity fibres filaments fish flabella fluid Foraminifera fossil fruit Fungi gemmules genus gland glass globules granules hair Haversian canals horny hydrochloric acid inch Infusoria inner surface interior layer light linear longitudinal magnified margin matter membrane microscope minute mode nature nearly object observed opaque organs orifice outer Ovum parallel peculiar periostracum placed plant polype portion present prism rays remarkable represented resemblance right angles scales seen septa shell side skin species specimens spicula spiculum spiral sponge sporangia sporules stomata stratum Strongylus structure substance tentacula terminations thick thin tion transparent transverse tubes valves vascular tissue vesicles vessels Volvox whilst worm Xanthidia Xanthidium
Page 201 - If we cast our eye to the upper part of the stem, we see a material, made for the purpose, used in no other class of animals, and in no other part of birds ; tough, light, pliant, elastic. The pith, also, which feeds the feathers, is, amongst animal substances, sui generis; neither bone, flesh, membrane, nor tendon*.
Page 88 - ... but make the part quite black by their numbers. They adhere so closely that scraping them off would tear up the skin. In a short time they increase to the size of a bean, or common tick, as seen in dogs, and fix themselves promiscuously on all parts of the hide where covered with hair. " 7. The same species appears to insinuate itself, in its incipient state, upon the human body, but is not known to assume the tick form there. They adhere tenaciously to the skin, and are believed to introduce...
Page 200 - Since of the four as yet well established great geological periods of the earth's formation, the quaternary, tertiary, and secondary formations contain recent organisms, it is as three to one more probable that the transition or primary formation is not differently circumstanced, but that, from the gradual longer decomposition and change of many of its organic relations, it is more difficult to examine and determine.
Page 122 - A rhomb of Iceland spar of one-fourth of an inch in length, and about four-eighths of an inch in breadth and thickness, is divided into two equal portions in a plane, passing through the acute lateral angle, and nearly touching the obtuse solid angle. The sectional plane of each of these halves must be carefully polished, and the portions cemented firmly with Canada balsam, so as to form a rhomb similar to what it was before its division; by this management the ordinary and extraordinary rays are...
Page 86 - See, through this air, this ocean, and this earth All matter quick, and bursting into birth. Above, how high, progressive life may go! Around, how wide! how deep extend below! Vast chain of being ! which from God began, Natures...
Page 201 - Its lightness, its smoothness, its warmth ; the disposition of the feathers all inclined backward, the down about their stem, the overlapping of their tips, their different configuration in different parts, not to mention the variety of their colours, constitute a vestment for the body, so beautiful, and so appropriate to the life which the animal is to lead, as that, I think, we should have had no conception of anything equally perfect, if we had never seen it, or can now imagine anything more...
Page 89 - ... increase to the size of a bean, or common tick, as seen in dogs, and fix themselves promiscuously on all parts of the hide where covered with hair. " 7. The same species appears to insinuate itself, in its incipient state, upon the human body, but is not known to assume the tick form there. They adhere tenaciously to the skin, and are believed to introduce themselves below it. They are very harassing, and even create soreness and inflammation. They generally affect persons who. have been passing...
Page 92 - On the Minute Structure of certain Substances expelled from the Human Intestine, having the ordinary appearance of shreds of lymph, but consisting entirely of filaments of confervoid type, probably belonging to the genus Oscillatoria" (
Page 197 - The well-known ciliary currents in the fringes of the oyster induced me to examine the contents of the stomach, under the expectation of finding some minute forms of Infusoria; for it seemed but reasonable to infer that the absence of locomotive power, and the consequent inability of seeking for food, might be compensated by so beautiful a contrivance for insuring constant nourishment.