THE BANGOR LABORATORIES. 485 



be answered by direct experiment. The labour of 

 observing proved too heavy, much of it could 

 scarcely be carried on without two or more persons 

 working together. I therefore invited students to 

 aid in the work. They willingly accepted the 

 invitation, and lent me most cheerful and able 

 help. Soon after, other students, hearing that 

 some of their class-fellows had got experimental 

 work to do, came to me and volunteered to assist 

 in the investigation. I could not give them all 

 work in the particular investigation with which I 

 had commenced "The electric convection of 

 heat " for want of means and time and possi- 

 bilities of arrangement, but I did all in my power 

 to find work for them on allied subjects (Electro- 

 dynamic Properties of Metals, 1 Moduluses of 

 Elasticity of Metals, Elastic Fatigue, Atmospheric 

 Electricity, &c.) I then had an ordinary class of 

 a hundred students, of whom some attended 

 lectures in natural philosophy two hours a day, and 



1 Results up to 1856, published under this title, as Bakerian 

 Lecture for 1856 (Trans. R. S., and republished recently in vol. ii. 

 of Col lee ted Papers. W. T. 



