The same subject.
The complement of the foregoing letter, about the drainage of the marshes of Decennonium, which are hereby granted to him, apparently 'sine fisco,' tax-free.
[But the meaning may be, 'the marshes which you drain sine fisco'—without help from the Treasury.]
The chief point of difference between this and the previous letter is that here Decius is allowed and encouraged to associate partners with him in the drainage-scheme, whom he is to reward according to their share of the work. Thus will he be less likely to sink under the enterprise, and he will also lessen men's envy of his success.