49. The branch of surgery that treats of adding artificial parts to the body to replace natural parts which are wanting. 50. The dried tubers of various orchids, used for food, like tapioca. _MENTIMETER NO. 15_: Word Discrimination. _Any real difference_ named by the candidate between the two words to be compared should be given credit _whether it appears in the following list or not_. The list merely points out some of the outstanding differences between the words of each pair, but does not attempt to list all of the possible differences. Any difference mentioned by the candidate which is confirmed by any standard dictionary should be sufficient to give full credit. 1. A bird lives in the air : A fish lives in the water flies swims has feathers has scales 2. A snake is long : A fly is short is a reptile is an insect crawls flies has no wings or legs has wings and legs 3. A pen writes only when it has : A pencil writes without ink ink is made of steel or is made of lead or soft hard metal material does not have to be has to be sharpened sharpened 4. An eagle flies very high and : A chicken flies very low and but long distances a short distance is wild is domestic is not good for food is good for food 5. A book usually has a hard cover : A magazine has a paper cover is usually one story, is several stories, by by one author different people is published once is published periodically 6. An orange has a reddish yellow : A lemon has a bright yellow colour colour is spherical in shape is oblong in shape is usually larger than is usually smaller than a lemon an orange is usually sweet is usually sour 7. A teacher works in a school : A preacher works in a church usually teaches usually addresses children grown-ups deals primarily with deals primarily with academic subjects religious subjects