. The essentials of botany. Botany. PROTOPLASM AND PLANT-CELLS. ferred. The most serviceable objectives are the -J and \ inch, giving magnifying powers of from about 100 to 500 diameters. Such a microscope may be purchased in this country for from $30 to $40, and in Europe for somewliat less. A scalpel or good razor is useful in making sections. For the beginner the only reagents necessary are, 1, a solution of iodine (that made by first dissolving a very little potassic iodide in pure water and then adding iodine is the best for common use); 3, a solution of caustic potash in pure water (pota
. The essentials of botany. Botany. PROTOPLASM AND PLANT-CELLS. ferred. The most serviceable objectives are the -J and \ inch, giving magnifying powers of from about 100 to 500 diameters. Such a microscope may be purchased in this country for from $30 to $40, and in Europe for somewliat less. A scalpel or good razor is useful in making sections. For the beginner the only reagents necessary are, 1, a solution of iodine (that made by first dissolving a very little potassic iodide in pure water and then adding iodine is the best for common use); 3, a solution of caustic potash in pure water (potassic hydrate); 3, alcohol; 4, some staining fluid, as magenta or carmine (common carmine ink is often quite satisfactory); 5, glycerine. (a) Make very thin longitudinal sec- tions of the tips of the larger roots of Indian corn (Fig. 3); stain some with iodine, which will turn the protoplasm brown or yellowisli brown; stain others with carmine; examine by the aid of the |-inch objective. Make similar sections of the tip of a young shoot of the asparagus. (J)) Make successive cross-sections of tlie root of Indian corn, beginning with the tip and receding five to ten centi- metres. Note the vacuoles and use iodine and carmine. Make similar sec- tions of young asparagus-stem. (c) Make a longitudinal section of the young part of a verbena-stem in such a manner as to leave on each margin a fringe of uninjured hairs. Mount carefully in pure water. Ex- amine at a high temperature (about 30° C. = 86° Falir.) for a streaming motion of the protoplasm in the -^,^ I"iQ. 2.âA little more than half rlace of a longitudinal section of the tip the specimen upon a block of ic^ and ^It^^-fbrefisS^eVody^m" note that the movement ceases. Warm root, that below it is the root-cap; rroin oto "â *hiok outsr wall of the epider- again, etc. uiig. nx, young pith-cells; /.young (d) With similar specimens observe wood-cells; g, a young vessel; s,i, ^, _ . !â /,%â¢]â 1 ;âi
Size: 1069px × 2336px
Photo credit: © Central Historic Books / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, bookpublisher, booksubjectbotany
