Elements of zoology, or, Natural Elements of zoology, or, Natural history of animals / ed. by Reese elementsofzoolog00rees Year: 1849 488 ZOOLOGY. cule, which is one of the most beautiful and interesting of all the species with which the microscope has made the observer familiar. Each globe was formerly regarded as a single ani- malcule, moving through the water by its own will; it was seen to contain smaller globes, which gradually increased, and at last gained exit by the rupture of the parent sphere, these second globes often being seen to contain within themselves r third generation
Elements of zoology, or, Natural Elements of zoology, or, Natural history of animals / ed. by Reese elementsofzoolog00rees Year: 1849 488 ZOOLOGY. cule, which is one of the most beautiful and interesting of all the species with which the microscope has made the observer familiar. Each globe was formerly regarded as a single ani- malcule, moving through the water by its own will; it was seen to contain smaller globes, which gradually increased, and at last gained exit by the rupture of the parent sphere, these second globes often being seen to contain within themselves r third generation before they escape from the first. It is no\i known, however, that each sphere is a collection of animal- cules ; the little projections upon its surface being distinct in- dividuals, each having its own cilia, by the simultaneous action of which the globe is caused to roll through the water. They are all connected by a delicate transparent membrane, which forms the wall of the hollow sphere, and which is to the indi- viduals something like what the polype-structure is to its com- ponent polypes ; these walls are traversed by vessels, which establish a certain degree of connection between the several beings. The interior globes consist of newly-formed associa- tions of a similar description ; they are of darker colour than that which contains them, because the animalcules of which they are composed are packed more closely together, the inter- vening walls not being yet developed. Many other such com- pound structures exist in various forms ; some of the most common being flattened shields, each of which separates into four divisions, every such part containing a certain number of individuals, and gradually assuming the form and size of its parent. 850. Our ideas of the great amount of animal life existing in this class have lately re- ceived a vast extension by the discovery that their remains, minute as they are, not un- frequently accumulate into masses of great extent. It is
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