POWELL] TECHNOLOGY LVII 



themselves, for here we luig-ht autag-ouize contending pathies. 

 Perchance, if I were quite honest, I would confess my inabil- 

 ity to treat the subject as a medical expert. Then the physi- 

 cian must be versed in the causes of disease, and he discovers 

 these causes in air, water, rocks, plants, and animals. Now, 

 we might reclassify these agencies of disease, but the discus- 

 sion would lead us too far from our theme, for we are not 

 writing a medical treatise, and it might lead us too far from 

 our knowledge. Then we are immediately led to the discov- 

 ery of remedies, and here again we strike upon tlie pentalogic 

 substances which are employed as remedies, and show how 

 substances, forms, forces, causes, and concepts are employed 

 as remedial agencies. Here again we must stop, lest we enter 

 into disputation and show oiu' ignorance. 



