. The history of creation; or, The development of the earth and its inhabitants by the action of natural causes. A popular exposition of the doctrine of evolution in general, and of that of Darwin, Goethe, and Lamarck in particular. s we prefer to consider them as an in-dependent tribe of the kingdom Protista. The monoplaatic Protophyta—that is, those primary Algaeformed by a single plastid—are of the greatest interest,because the vegetable organism in this case completes itswhole couise of life as a perfectly simple individual of thefirst order, either as a cytod without kernel, or as a cellc
. The history of creation; or, The development of the earth and its inhabitants by the action of natural causes. A popular exposition of the doctrine of evolution in general, and of that of Darwin, Goethe, and Lamarck in particular. s we prefer to consider them as an in-dependent tribe of the kingdom Protista. The monoplaatic Protophyta—that is, those primary Algaeformed by a single plastid—are of the greatest interest,because the vegetable organism in this case completes itswhole couise of life as a perfectly simple individual of thefirst order, either as a cytod without kernel, or as a cellcontaining a kernel Among the primary plants consisting of a single cytod a]ethe exceedingly remarkable Siphonese, which are of con-siderable size, and strangely mimic the forms of higherplants. Many of the Siphonese attain a size of severalfeet, and resemble an elegant moss (Bryopsis), or insome cases a perfect flowering plant with stalks, roots,and leaves (Caulerpa) (Fig. 17). Yet the whole of thislarge body, externally so variously dift^rentiated, consistsinternally of an entirely simple sack, possessing the negativecharacters of a simple cytod. These curious Siphoneas, Vaueherise, and Caulerpse show UNI-CELLULAR ALG^.. blG. 17.—Caulerpa denticulata, a niouoplastic Mphoiietin of the naturalsize. The entire branching primary plant, ?which appears to consist of acreeping stalk with fibrous roots and indented leaves, is in reality only asingle plastid^ and moreover a cytod (without a kernel), not even attainingthe grade of a cell with nucleus. US to how great a degree of elaboration a single cytod,althougli a most simple individual of the first order, candevelop by continuous adaptation to the relations of theouter world. Even the single-celled primary plants—whichare distinguished from the monocytods by possessing akernel—develop into a great variety of exquisite forms byadaptation ; this is the case especially with the beautiful 88 THE HISTORY OF CREATION. Desmidiaoi
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