Bulletin of the United States National MuseumSmithsonian Institution Press, 1884 |
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Common terms and phrases
1-pound and 2-pound abundant Alaska apparatus Atlantic coast bait Bedford blubber boat bone bone phosphate Boston bottom brand breeding California cent clams Collective Ex Commission of Fish Connecticut Cooked preparations Coues Crab depth District of Columbia DIVISION E. W. Nelson Edgartown eggs Exhibit feet long Fish and Fisheries fishermen Florida Fresh Gloucester glue Groups guano harpoon hatching hibit inches iron isinglass Jersey lance Length Light-House Linn liquid isinglass Lobsters Long Island Sound Mackerel Maine manufacture Maryland Massachusetts Menhaden Model months old mounted birds National Museum North America ounces oysters Pacific coast patent Point Barrow pounds Prawns Provincetown reel River Saint Salmon Sample shank shells Shrimp skins South Carolina south in winter species specimens Sponge toggle Trout Twine U. S. Fish Commission United States Commission United States Fish United States National vessels Virginia W. H. Dall Washington whale whalemen wood York City
Popular passages
Page iii - No. 23) is the twenty-ninth of a series of papers intended to illustrate the collections of natural history and ethnology belonging to the United States, and constituting the National Museum, of which the Smithsonian Institution was placed in charge by the act of Congress of August 10, 1846.
Page 5 - To prosecute investigations on the subject (of the diminution of valuable fishes) with the view of ascertaining whether any and what diminution in the number of the food-fishes of the coast and the lakes of the United .States has taken place ; and, if so, to what causes the same is due ; and also whether any and what protective, prohibitory, or precautionary measures should be adopted in the premises, and to report upon the same to Congress.
Page 26 - ... primitive mouth was situated at an earlier stage. The digestive cavity now becomes greatly enlarged and cilia make their appearance upon its walls, the mouth becomes connected with the chamber which is thus formed and which becomes the stomach, and minute particles of food are drawn in by the cilia and can now be seen inside the stomach, where the vibration of the cilia keep them in constant motion. Up to this time the animal has developed without growing, and at the stage shown in plate vm,...
Page 22 - It is now nearly spherical, as shown in plate vin, fig. 2, and the germinative vesicle is no longer visible. The male cells may or may not still be visible upon the outer surface. In a short time a little transparent point makes its appearance on the surface of the egg and increases in size and soon forms a little projecting transparent knob — the polar globule — which is shown in fig.
Page 25 - Soon after they make their appearance, the embryos cease to crowd to the surface of the water, and sink to various depths, although they continue to swim actively in all directions, and may still be found occasionally close to the surface. The region of the body which carries the cilia now becomes...
Page 20 - Although the primary object of the expedition is the promotion of the great interests of commerce and navigation, yet all occasions will be taken, not incompatible with the great purpose of the undertaking, to extend the bounds of science, and to promote the acquisition of knowledge.
Page 23 - Fig. 13, plate vm, is a sectional view of such an embryo. It is seen to consist of a central cavity, the digestive cavity, which opens externally on the dorsal surface of the body by a small orifice, the primitive mouth, and which is surrounded at all points, except at the mouth, by a wall which is distinct from the outer wall of the body. Around the primitive mouth these two layers are continuous with each other. The way in which this cavity, with its wall and external opening, has been formed will...
Page 21 - Straits, of the North Pacific ocean, and the China seas, as are frequented by American whale-ships, and by trading vessels, in their routes between the United States and China.
Page 27 - The fact that the young may be collected in this way in any part of the Chesapeake Bay shows that the young oysters must settle down upon the bottom in nearly all parts of the bay, and we should expect the adults to have an equally general distribution. This is far from the case, and nothing could be farther from the truth than the idea that the bottom of the waters of the oyster...
Page 23 - This layer is seen in the section to be pushed in a little toward the upper layer, so that the lower surface of the disk-shaped embryo is not flat, but very slightly concave. This concavity is destined to grow deeper until its edges almost meet, and it is the rudimentary digestive cavity. A very short time after this stage has been reached, and usually within from two to four hours after the eggs were fertilized, the embryo undergoes a great change of shape, and assumes the form which is shown in...