14 LECTURES TO SCIENCE TEACH EES. 



polarisation is connected with the position of the sun. But 

 the position of the sun, or, as I ought here to express it, the 

 position of the plane of sky polarisation, reminds me that it 

 is time to draw this discourse to a close. I therefore bid 

 you farewell, with a hearty wish that you may pursue this 

 subject further for yourselves, and with a firm conviction 

 that you will find any labour bestowed upon it abundantly 

 repaid. 



