Principles of Zoology: Touching the Structure, Development, Distribution ...
Principles of Zoology: Touching the Structure, Development, Distribution ...
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tive dot are found in the eggs of all animals ; and out of these, and of these only, the germ is formed, in the position shown by Fig. 101, e.
287. The vitellus or yolk (Fig. 101, y) is the most essen- tial part of the egg. It is a liquid of variable consistence, sometimes opaque, as in the eggs of birds, sometimes trans- parent and colorless, as in the eggs of some fishes and mollusks. On examination under the microscope, it appears to be composed of an accumulation of granules and oil-drops.
...12* Digitized by Google 138 EMBBY0L06T.
The yolk is surrounded by a very thin skin, the vitelline men^aney (Fig. 98, v.) In some insects, when the albumen is wanting, this membrane, surrounded by a layer of pecu- liar cells, forms the exterior covering of the egg, which, in such cases, is generally of a firm consistence, and sometimes even homy.
288, The germinative vesicle (Fig. 98, g) is a cell of ex- treme delicacy, situated, in the young egg, near the middle of the yolk, and easily recognized by the greater transpar- ency of its contents when the yolk is in some degree opaque, as in the hen^s egg, or by its outline, when the yolk itself is transparent, as in eggs of fishes and moUusks.
What to read after Principles of Zoology: Touching the Structure, Development, Distribution ...?
You can find similar books in the "Read Also" column, or choose other free books by Louis Agassiz, Augustus Addison Gould to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
tive dot are found in the eggs of all animals ; and out of these, and of these only, the germ is formed, in the position shown by Fig. 101, e.
287. The vitellus or yolk (Fig. 101, y) is the most essen- tial part of the egg. It is a liquid of variable consistence, sometimes opaque, as in the eggs of birds, sometimes trans- parent and colorless, as in the eggs of some fishes and mollusks. On examination under the microscope, it appears to be composed of an accumulation of granules and oil-drops.
...12* Digitized by Google 138 EMBBY0L06T.
The yolk is surrounded by a very thin skin, the vitelline men^aney (Fig. 98, v.) In some insects, when the albumen is wanting, this membrane, surrounded by a layer of pecu- liar cells, forms the exterior covering of the egg, which, in such cases, is generally of a firm consistence, and sometimes even homy.
288, The germinative vesicle (Fig. 98, g) is a cell of ex- treme delicacy, situated, in the young egg, near the middle of the yolk, and easily recognized by the greater transpar- ency of its contents when the yolk is in some degree opaque, as in the hen^s egg, or by its outline, when the yolk itself is transparent, as in eggs of fishes and moUusks.
What to read after Principles of Zoology: Touching the Structure, Development, Distribution ...?
You can find similar books in the "Read Also" column, or choose other free books by Louis Agassiz, Augustus Addison Gould to read onlineMoreLess
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