Botany of the Southern states . C Q^r^ The grains are regularly formed, being composed of concen-tric layers with an insoluble external covering, and each grainhaving one or more points on its surface, resembling the bilumof a seed. (Fig. 168, a, potato grains; Fig. 168, b, wheatgrains; Fig. 168, c, rice grains.) It is an interesting employ- 284. What is gun-cotton? What is collodion? For what used?— is the constitution of starch? Where does it exist? Describe thegrains. Where found? What are the properties of starch? VEGETABLE PRODUCTS. 149 ment for the student to examine the form of
Botany of the Southern states . C Q^r^ The grains are regularly formed, being composed of concen-tric layers with an insoluble external covering, and each grainhaving one or more points on its surface, resembling the bilumof a seed. (Fig. 168, a, potato grains; Fig. 168, b, wheatgrains; Fig. 168, c, rice grains.) It is an interesting employ- 284. What is gun-cotton? What is collodion? For what used?— is the constitution of starch? Where does it exist? Describe thegrains. Where found? What are the properties of starch? VEGETABLE PRODUCTS. 149 ment for the student to examine the form of grains in differentplants with a magnifying power of at least 100 linear. By rub-bing up any cellular substance in water, and washing the massin a linen cloth in a vessel of water, the starch grains will passthrough the cloth and settle in the water. The starch grains inhot water swell up thirty times their volume and spread out,forming the paste used for stiffening clothes. At the tempera-ture of 150° it is converted into d
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Keywords: ., bookcentury1800, bookdecade1860, bookpublisher, booksubjectbotany
