The Cell Doctrine Its History And Present State
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In all cells the nuclei afford different chemical re- actions from those of the substance of the element. Each cell is an independent organism, passing through various stages of development, from birth to death.
The birth (origin) of the elements takes place by 1st, segmentation; 2d, genesis; 3d, epigenesis; 4th, germination.
1st. Segmentation. The human ovum is a small hollow sphere, containing in its interior the vitellus or yolk, which consists of granular matter in a hya- line substance. At... the end of a certain time parti- cles of the granular matter approximate, unite and form a nucleus in the vitellus. Next, the nucleus elongates, takes an hour-glass form (biscuit), then divides. The division of the yolk occurs simultaneously. In the same way, the division takes place into 4, 8, 16, and more parts. These divisions of the vitellus have re- ceived the name vitelline globules. Their mode of formation is called segmentation.
2d. Genesis. When the vitelline globes have be- 92 THE CELL DOCTRINE.
What to read after The Cell Doctrine Its History And Present State?
You can find similar books in the "Read Also" column, or choose other free books by Tyson, James, 1841-1919 to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
In all cells the nuclei afford different chemical re- actions from those of the substance of the element. Each cell is an independent organism, passing through various stages of development, from birth to death.
The birth (origin) of the elements takes place by 1st, segmentation; 2d, genesis; 3d, epigenesis; 4th, germination.
1st. Segmentation. The human ovum is a small hollow sphere, containing in its interior the vitellus or yolk, which consists of granular matter in a hya- line substance. At... the end of a certain time parti- cles of the granular matter approximate, unite and form a nucleus in the vitellus. Next, the nucleus elongates, takes an hour-glass form (biscuit), then divides. The division of the yolk occurs simultaneously. In the same way, the division takes place into 4, 8, 16, and more parts. These divisions of the vitellus have re- ceived the name vitelline globules. Their mode of formation is called segmentation.
2d. Genesis. When the vitelline globes have be- 92 THE CELL DOCTRINE.
What to read after The Cell Doctrine Its History And Present State?
You can find similar books in the "Read Also" column, or choose other free books by Tyson, James, 1841-1919 to read onlineMoreLess
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