. The elements of structural botany [microform] : with special reference to the study of Canadian plants ; to which is added a selection of examination papers. Plant anatomy; Botany; Plantes; Botanique. Elements of structural botany. 8 the plant. It is nearly white. Then it is not of th\3 same foim as the part of the plant ahove ground. It is made up of a number of thread-like parts which spread out in all directions, and if you examine one of these threads through your magnifying glass, you will find that from its surface are given off many finer threads, called rootlets. These latter are of
. The elements of structural botany [microform] : with special reference to the study of Canadian plants ; to which is added a selection of examination papers. Plant anatomy; Botany; Plantes; Botanique. Elements of structural botany. 8 the plant. It is nearly white. Then it is not of th\3 same foim as the part of the plant ahove ground. It is made up of a number of thread-like parts which spread out in all directions, and if you examine one of these threads through your magnifying glass, you will find that from its surface are given off many finer threads, called rootlets. These latter are of great im. portance to the plant; it is largely by means of their tender extremities, and the parts adjacent to these, that it imbibes the nutritious fluids contained in the soil. Whilst you are looking at these delicate rootlets, you may perhaps wonder that they sliould be able to make their way through the soil, but. how they do this will be apparent to you if you lexamine th« tip of one of them with a microscope of considerable power. Fig. 2 repre- sents such a tip highly magnified. It is to be observed that the growth of the rootlet does not take place at the very extremity, but immediately behind it. The extreme tip consists of harder and firmer matter than that behind, and is in fact a sort of cap or thimble to protect the growing part underneath. As the rootlet grows, this little thimble is pushed on first through the crevices of the soil, and, as you may sup- pose, is soon worn away on the outside, but it is as rapidly renewed by the rootlet itself on the inside. Another difference between the root and the part above ground you will scarcely have failed to discover: the root has no leaves, nor has it any Fig. 2. You may describe the root of the Buttercup Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble
Size: 1392px × 1796px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., book, bookcentury1800, booksubjectbotany, booksubjectplantanatomy
