. Elements of botany. Botany; Botany. 22 ELEMENTS OP BOTANY. Test in this manner wheat (in the shape of flour), oats (in oatmeal), barley, rice, buckwheat, flax, rye, sunflower, four-o'clock, morning-glory, beans, peanuts, hazel-nuts, and any other seeds that you can get. Report your results in tabular form as follows : Much Starch. Little Starch. No Starch. Color, blackish or Color, pale blue or Color, brown, orange, dark blue. greenish. or yellowish. 31. Microscopical Examination of Starch. — Examine starch in water with a rather high power of the microscope (not less than 200 diameters). Pu
. Elements of botany. Botany; Botany. 22 ELEMENTS OP BOTANY. Test in this manner wheat (in the shape of flour), oats (in oatmeal), barley, rice, buckwheat, flax, rye, sunflower, four-o'clock, morning-glory, beans, peanuts, hazel-nuts, and any other seeds that you can get. Report your results in tabular form as follows : Much Starch. Little Starch. No Starch. Color, blackish or Color, pale blue or Color, brown, orange, dark blue. greenish. or yellowish. 31. Microscopical Examination of Starch. — Examine starch in water with a rather high power of the microscope (not less than 200 diameters). Pulp scraped from a potato, wheat flour, the finely powdered starch sold under the commercial name of "corn- starch " for cooking, oatmeal and buck- wheat finely powdered in a mortar, will furnish five excellent examples of the shape and markings of starch-grains. Sketch all of the kinds examined, tak- ing pains to bring out the markings.' Compare the sketches with Figs. 10 and 11. With a medicine-dropper or a very small pipette run in a very little iodine solution under one edge of the cover- glass, at the same time withdrawing a little water from the margin opposite by touching to it a bit of blotting-paper. Examine again and note the blue color- ation of the starch-grains and the un- stained or yellow appearance of other substances in the field. Cut very thin slices from beans, peas, or kernels of corn; mount in water, stain as above directed, and draw as seen under the microscope. Compare with Figs. 10 and 11.^ Note the fact that the starch is not packed away. Fig. 10. — Starch-Grains stored in Cell in a Grain of Indian Corn. 1 The markings will be seen more distinctly if care is taken not to admit too much light to the object. Rotate the diaphragm beneath the stage of the microscope, or otherwise regulate the supply of light, until the opening is found which gives the best effect. 2 The differentiation between the starch-grains, the other cell-contents, and the
Size: 1328px × 1881px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, booksubjectbotany, bookyear1896
