. Map modeling in geography : including the use of sand, clay putty, paper pulp, plaster of Paris, and other materials : also chalk modeling in its adaptation to purposes of illustration. Testing for Starch. 211 twigs and lay their eggs in the wounds. The so-called oak-applesfound on the leaves of our red oaks are gallnuts, but are not valu-able like those found in Western Asia, because they do not con-tain so much tanmn or ink-producing acid. Shall we find the starch in the acorn? Let me put thesegrains of -starch into this tube (A) with some water, and Charlie. Fig. 98. may hold it over the
. Map modeling in geography : including the use of sand, clay putty, paper pulp, plaster of Paris, and other materials : also chalk modeling in its adaptation to purposes of illustration. Testing for Starch. 211 twigs and lay their eggs in the wounds. The so-called oak-applesfound on the leaves of our red oaks are gallnuts, but are not valu-able like those found in Western Asia, because they do not con-tain so much tanmn or ink-producing acid. Shall we find the starch in the acorn? Let me put thesegrains of -starch into this tube (A) with some water, and Charlie. Fig. 98. may hold it over the lamp until the water boils. Here is anothertube with water, and I shall put into it these pieces of oak-breadfrom the acorns. Mary may boil this (B) over the lamp. NowI take these two little crystals (potassium iodide) and drop oneinto each tube. Hold the tubes over the lamp again until thewater boils. The crystals are now dissolved. Into the starchliquid I put three drops of this acid (hydrochloric), and see ! 212 The Chimpu. The liquid is blue. Chemists say that the starch has beencolored blue. Mary may take this little dropping-glass and putthree drops of the acid into the other tube which has the piecesof acorn in it. Look ! It is blue like the other. Thereis starch in acorns. A wise man has said, Read Nature in thelanguage of experiment. IV. A Queer Counting Device. The Chimpu Used by Peruvian and Bolivian chimpu is a reckoning device still employed in some re-mote parts of Peru and Bolivia. It consists principally of a cer- FiG. 99.—Th
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Keywords: ., bookcentury1800, bookdecade1890, bookidmapmodelingi, bookyear1894
