==Inconsistency in use of privatives or not?== 
 I feel that there must be some better example of inconsistency than "invaluable".  Coming from a non-English background I did not see "invaluable" as the least inconsistent, given that the equivalent in my mother tounge Swedish (ovärderlig) makes it clear that the basis most likely is "value-able" as in "possible to assigne a value to" rather than "valuable" as in "precious". The text does point this out later on but still draws heavily on this mixup to point out that the privative use is inconsistent. 

 Spontaneously I cannot come up with a more suiting example of the alleged inconsistency, and maybe this inconsistency is just a mirage? Maybe it would be better to write a paragraph about the fact that it sometimes might seem that privatives are used inconsistently in English, although they are not, and then demonstrating it with the two examples used now to show that there are inconsistencies ("invaluable" and "inflammable")? 

 I don’t feel I have the expertise in this area to say whether there are actually inconcistencies or not so if anyone with deeper knowledge about privatives in English could look over the article that would be great.