=105. Directions.= Repeat Exp. 51, but in place of the ebonite, use hot tissue-paper, hot brown paper, hot newspaper, or a hot silk handkerchief. Rub your hand vigorously over them. Do these become charged? =EXPERIMENTS 53-54. To study electrical attractions.= _Apparatus._ The ebonite sheet, E S (No. 26); flannel cloth, F C (No. 30); small pieces of dry tissue-paper, T P (No. 31); thread (No. 32). =106. Directions.= (A) Thoroughly electrify E S as before, then lift and hold it in the air. (Fig. 28.) (B) See what the paper and thread will do when held loosely near E S. _=107. Discussion.=_ Exp. 53 shows that _an electrified body attracts neutral ones_. This much was known about electricity over 2,000 years ago. They didn't have ebonite then, but some of the educated men of Greece knew that amber would attract light bodies after being rubbed. The Greek word for amber is _elektron_, and from this has been made the word _electricity_. =EXPERIMENT 54.= =108. Directions.= Charge a sheet of hot paper by friction; lift it, by its opposite ends, and lower it over small pieces of tissue-paper placed on the table. What happens to the little pieces? =EXPERIMENT 55. To study mutual attractions.= _Apparatus._ The support and its attachments (See § 109); support wire, S W (No. 36); silk thread, S T (No. 33), or a rubber band, R B (No. 45); ebonite rod, E R (No. 28); flannel cloth, F C (No. 30); wire swing, W S (No. 37). Tie one end of S T to W S, Fig. 29; tie the other end of S T to S W; adjust W S by bending, if necessary, so that it will securely hold E R. It will be found convenient to use a rubber band instead of S T; if you do, let W S straddle one end of R B (Fig. 33), and hang the other end of R B upon S W. =109. The support= consists of a support base (S B, Fig. 56), a support rod (S R, Fig. 56), and a support wire (S W, Fig. 29). There is a small hole in one end of S R to receive the wire, S W, and a large hole in the other end to take the short ebonite which holds the insulating table (Fig. 32). A little paper should be wound around the lower end of S R, so that it will stand solidly in the spool which forms a part of the base. =110. Directions.= (A) Electrify E R with F C, and place E R in the swing, W S (Fig. 29). [Illustration: Fig. 29.] (B) Bring your finger near one side of the rubbed end of E R, then near the unrubbed end, and compare the results. =111. Mutual Attractions.= _A neutral body_, like the hand, for example, _attracts electrified ones_. From Exp. 53, 54, 55, it is seen that the attraction between a neutral and an electrified body is mutual; each attracts the other. =EXPERIMENT 56. To study electrical repulsions.= _Apparatus._ Same as for Exp. 55; ebonite sheet, E S (No. 26). =112. Directions.= (A) Charge E R, and place it in W S, Fig. 29.