7. Explain how the fore limbs of some Mammals are modified from the ordinary type to meet certain peculiarities in the habits of those animals. Illustrate your answer by examples. 8. Compare the Human skeleton with that of the Orang. 9. From what Animals and from what parts of those animals are the following substances obtained, Spermaceti, Isinglass, Tripe, Sweetbread, Rennet, Cochineal? 10. Describe the sternum in a bird of flight. How is it supported? How does it differ from the sternum of a bird like the Ostrich? TUESDAY, July 4, 1871. 4 to 6. Chemistry 1. STATE the ordinary laws of diffusion of gases, and describe some experiment in confirmation of the different rates of diffusion of gases of different densities. 2. State the composition of ammonia by weight and by volume. Describe its preparation and explain the chemistry of the process. Describe the substance so prepared and give its action on (1) nitric acid, (2) sulphuretted hydrogen, (3) ferric chloride, (4) corrosive sublimate. 3. Describe the elements carbon, phosphorus, sodium. What kind of impurities can be separated from water by filtering through charcoal? Upon what does this property of charcoal depend? 4. Under what circumstances does light carburetted hydrogen occur in nature, and by what different names is it known? A mixture of this gas and air may be burnt safely if it issues through a narrow metal tube, but not if it issues through a glass tube: explain the reason of this. 5. Give an account of the preparation of sulphuric acid as it is usually conducted in this country, and explain the chemistry of the process. 6. Trace the changes which occur when a piece of limestone is (1) burnt in a kiln, (2) when the lime is slaked, (3) when the slaked lime is exposed to chlorine, (4) when the product so obtained is acted on by dilute sulphuric acid. 7. How do cast iron, steel and malleable iron differ from each other? What is pig iron? What is its general composition? Explain how it is converted into (1) malleable iron, (2) steel. 8. What is an alum? How do iron-, ammonia-, chromeand potash-alum differ from one another and how are they related? 9. Explain how the combining weight of silver is found. What is meant by its quantivalence ? 3 grams of an alloy of silver gave when dissolved in nitric acid and precipitated by hydrochloric acid 3.637 grms of silver chloride: what was the proportion of silver in the alloy? (Ag: Cl = 108 : 35·5.) 10. Give a short account of the acids homologous with acetic acid. 11. Describe, and explain, the process of making common ether. N.B. There will be an examination in practical chemistry at some time to be fixed by the local examiner. 4 5 Put three upper parts to the following bass, using triads or common chords only. In what time (common or triple) is the national tune of "God save the Queen," written? 6 7 Why is a discord so called? Give a specimen. Supply the wanting voices or parts to the following bass, and give the root of each harmony. 8 Point out the ornamental notes (notes not belonging to the real harmony) in the following extract. *The G or treble clef can be used if more convenient to the candidate, but credit will be given for the use of the C clef. |