File:Birds and nature (1903) (14750420972).jpg

Identifier: birdsnature131903chic (find matches)
Title: Birds and nature
Year: 1900 (1900s)
Authors:
Subjects: Birds Natural history
Publisher: Chicago, Ill. : A.W. Mumford, Publisher
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Biodiversity Heritage Library

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driftingwith every current. The one-celled ani-mals are very numerous in species, andoften have the power to move very quick-ly through the water, though at timesthey are firmly attached to the rocks orplants. One of the commonest of the sta-tionary animals is the bell animalcule. Itlooks like a small transparent bell mooredby a slender colorless rope. But this ropehas a queer trick of looking all at oncelike a watch spring, and sometimes ofdisappearing altogether, and the littlebell is held quite close to the anchorage.But even this animal, which must spendits life in one place and can only move upand down like a jack-in-the-box, livesupon diatoms and desmids, both of whichhave the power of moving from place toplace. Among the diatoms in our river youwill sometimes see a crescent shapedboat with green instead of brown chloro-phyll. This is a desmid, another one-celled plant which is much esteemed asfood by many other animals besides thebell animalcule. WiLMATTE Porter Cockerell. 222
Text Appearing After Image:
FROM COL. CHI. ACAO. SCIENCES. 574 Disticboiora iiitida Easl Indies).Millepora alcicort.is (Florida). Stylaster sanguineus (Eastlndlesv THE HYDROID CORALS. The simplest corals belong to the classHydrozoa. This class is divisible intotwo well marked divisions or orders; first,the Hlydroidea, comprising the fresh-water hydra and the marine hydroids,and, second, the Sc)fphozoa or jellyfishes. A few species of the first ordersecrete a limy support, but the greatermajority are soft and jelly-like. The Hydroids have a more or less sac-like body which is usually attached tosome object by a pedicel or stem ofgreater or lesser length. They are colo-nial animals, like true corals, and hun-dreds or even thousands live together inclusters, forming huge colonies. As inthe sea anemones, the mouth is placed atthe upper end and is surrounded by a rowof hollow tentacles, which are very con-tractile and are seldom in the same posi-tion for more than a few seconds. A fewof the Hydroids are capable of lo

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