WHAT IS COLOR? 157 



(6) and the longest produces the sensation of (7) All 



(8) produced in the sun mixed together give (9) Any two 



colors which when mixed produce white are (10) colors. Blue 



and yellow (11) when mixed produce (12) If you look at 



a red book through blue glass, it will appear (13) because the 



glass transmits only (14) and the book (15) blue. 



STORY TEST 



HARRIET REPORTS UPON HER EXPERIMENTS 

 Read carefully and critically. List all the errors and suggest corrections. 



Having an uncle who is a glass maker, I teased him to make me 

 three prisms ; one of white glass, one red, and the third green. I 

 used these in a dark room into which a beam of sunlight came 

 through a small hole in the shutter. I had a screen of white paper, 

 one of black paper, one of green, and wore a red dress. When I 

 held the white glass in the beam of sunlight to form the solar 

 spectrum, the colors could be seen upon the white screen. When 

 thrown upon my red dress, the whole beam was changed to red. 

 When thrown upon the green screen, I saw only a small green band 

 of color. I then took the red prism and made a spectrum of all 

 colors on the white screen. When thrown on the red dress, the red 

 was absorbed and all the other colors were seen. Then I used the 

 green glass. When the black paper was held in position, there 

 was just a narrow green band of color upon it, but it showed a red 

 band when the beam was directed to the red dress. The green 

 screen showed a green color and the white screen showed all the 

 spectrum colors. 



THE REVIEW SUMMARY 



In preparing a summary of what you have learned in this unit, 

 you will want to place emphasis on the big ideas which have come 

 out of the applications of the facts you have learned and the demon- 

 strations you have seen. The generalizations that can be made 

 on this unit are numerous. You may change the list that follows 

 if you so desire, as this is only giving you a partial list of those 

 that you might make for your review summary. 



