POWELL] TECHNOLOGY XLIII 



Heat power. This power is obtained from the coinbustion 

 of plants and animals and the hydrocarbon products derived 

 from them. Steam is l^ut a medium through which heat 

 power is applied. 



Electric ■power. Electric power is also a medium for trans- 

 mitting wind power, water power, and heat power; but it also 

 seems to be an independent power itself. Not being a phys- 

 icist I am not competent to properly discuss this subject. 



The whole discussion of mechanics may be considered as 

 exceedingly elementary and to be but a simple exposition of 

 common knowledge. It serves the purpose of this discussion 

 all the better for this fact, for we are trying to exhibit the 

 nature of the activities in which men engage for the purpose 

 of classifying them and discovering how five properties of 

 matter, and only five, are recognized in these activities, and 

 for the further purpose of showing how they lead to five classes 

 of emotions. 



Commerce 



The fourth great class of industries in which men engage 

 for the purpose of obtaining welfare is commerce. Men do not 

 produce substances everyone for himself, but everyone for 

 others. They do not produce constructioiLS everyone for 

 himself, but everyone for others. They do not produce 

 powers everyone for himself, but they produce jiowers every- 

 one for others. The substances, artifacts, and powers pro- 

 duced are designed for the consumption of others; they thus 

 become the materials for exchange, which are then goods. 



Goods are produced, as we have already seen, by substan- 

 tiation, construction, and mechanics, and there are other 

 agencies which we have not yet considered. These products 

 pass from one person to another in exchange before they are 

 consumed as an entelechy. Every exchange implies a pro- 

 duction and a consumption until the entelic consumption is 

 reached. 



The five properties of matter give rise to five elements of 

 commerce, which we nuist now set forth. The first element 

 of commerce consists of the goods or kinds of things which 

 are exchanged. Tiie second element is transportation, which 



