. Introduction to botany. Botany. Laboratory Equipment. 377 material should be well soaked in warm water before using. It is still better, after soaking dry roots, stems, or pieces of dry wood, to place them in equal parts of alcohol, glycerine, and water, for a week or so before sectioning. To cut a cross section of astern or root, trim one end squarely across with a sliding stroke of a sharp knive; then hold the object between the thumb and forefinger, flood the upper face of the razor with water or 50% alcohol, and rest it on the forefinger with the point against the object; regulate the th
. Introduction to botany. Botany. Laboratory Equipment. 377 material should be well soaked in warm water before using. It is still better, after soaking dry roots, stems, or pieces of dry wood, to place them in equal parts of alcohol, glycerine, and water, for a week or so before sectioning. To cut a cross section of astern or root, trim one end squarely across with a sliding stroke of a sharp knive; then hold the object between the thumb and forefinger, flood the upper face of the razor with water or 50% alcohol, and rest it on the forefinger with the point against the object; regulate the thickness of the section to be cut by raising or lowering the forefinger, and cut the section with a long forward stroke (see Fig. 200). The sections usually need to be made as thin as they can possibly be cut. The upper face of the razor is kept wet in order. Showing the method of holding the object and razor in cutting sections free-hand. that the sections may easily slide over the blade without crumpling or rolling up. As the sections are cut, they should be transferred to a dish of water, and should not at any time be allowed to dry. Leaves and some succulent stems and roots need to be embedded in elder pith before sectioning, and for such purpose a good supply of dry pith should be kept on hand. A piece of the pith not more than an inch in length is halved longitudinally with a sliding stroke of a knife, while held on a table firmly between the thumb and fingers to keep it from breaking. If a leaf is to be sectioned, a strip of it is placed between the pieces of pith, and then leaf and pith are sectioned to- gether, the razor being kept wet as before, preferably Method of inclos- with 50 % alcohol. If succulent stems and roots are '"g ^" °^ject in to be sectioned, longitudinal V-shaped grooves are cut in both pieces of pith, of proper size to clamp the material firmly (Fig. 201). Fig. Please note that these images are extracted from scanned page images that
Size: 2734px × 914px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectbotany, bookyear1902
