By W. Belfield, M. Dearden and G. L. Watt (Auth.)
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THE MAMMAL slowly away from the eyes and then towards them. Note what happens to the spot. Repeat for the other eye. Exercise to calculate the size of the blind spot Method. Support your partner's chin on the edge of a large book so that his eyes are about 25 cm above the bench (Fig. 21). Below his eyes pin a large piece of paper to the bench so that a cross marked in black ink on the paper is below his right eye. Your partner closes his left eye and concentrates on the cross with his right. Now lay a piece of paper on which is marked a spot near its edge onto the paper with the cross so that the spot is quite close to the cross.
G. glucose (grape sugar),fructose(fruit sugar) Fehling's test Make a solution or suspension of the substance being tested. Add a little Fehling's solution (p. 160) to a few ml. of the solution or suspension in a test-tube. Boil gently for a minute or so. If a monosaccharide is present a red, orange or yellow precipitate will develop. Benedict's test Add about 5 ml Benedict's reagent (p. 160) to about 1 ml of the solution being tested in a test-tube. Gently boil. A brick-red precipitate of cuprous oxide results if a monosaccharide is present.
On the whole, however, this is not as satisfactory a method as either Method 2 above or Method 4 below. Method 4. This is exactly as described in Method 3 given on p. 70. Exercise illustrating how the skin works as a temperature receptor Method. Fill three beakers with water of different temperatures, the first with very cold, the second with tap water and the third with hot water. Place the three beakers in a row and then dip your index finger into each in the following order for about 15 seconds : tap water, very cold water, tap water, hot water, tap water.
A Practical Course in Biology by W. Belfield, M. Dearden and G. L. Watt (Auth.)
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