194 



EECEEATIVE SCIENCE. 



Taking the above Ascending Treble Staff 

 for a basis ; calling a second two, a third three, 

 and treating the other Intervals in a similar 

 manner ; and letting the E upon the first line 

 ^tand for the figure one, enforce your ac- 

 quaintance with these Intervals by means of 

 the following— 



Peoblems upon Section III. 



Write the numbers— 1. 1847;* 2. 23578; 

 3. 421345; 4. 235218; 5. 1478642; 6. 

 2468643; 7. 1358978. 



Solutions. 





The foregoing are exercises upon the 

 Ascending Staff. It is equally necessary to 

 practice downwards. The same numbers may 

 next be used in connection with the Descend- 

 ing Staff above printed ; the E in the fourth 

 space standing for the figure one, and the E 

 upon the first line for eight. 



• i.e., Write the first note, then the eighth, then the 

 fourth (from E, 1), then the seventh. 



Solutions. 



These are given as a means of habituating 

 the young student to measure distances or 

 Inteevals in ascending and descending ; to 

 be able to do which readily will be of incal- 

 culable advantage to him. 



W. Newman. 



EEFLECTION EEOM POLISHED 

 SUEFACES. 



EvEEY one sees that when light, homogeneous 

 or mingled, falls upon any rough surface, it 

 is differently acted upon than would be the 

 case were that surface either artificially or 

 naturally polished. In the former case, cer- 

 tain rays are supposed to be absorbed, and 

 others, producing its colour, reflected. As 

 regards polished surfaces, we find that the 

 light falling upon them, whether homogeneous 

 or mixed, is reflected in a different manner. 

 If white light falls upon a surface of polished 

 brass, it is found that the objects in front of 



