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The citation is ambiguous. It may mean:

2 Stat. 309 (Chapter 5)

You can view this U.S. Statutes at Large citation at these source(s):

2 Stat. 309

U.S. Statutes at Large

Legisworks

PDF - https://govtrackus.s3.amazonaws.com/legislink/pdf/stat/2/STATUTE-2-Pg309.pdf

We also found 1 parallel citation:

Pub. L. 8-5

U.S. Law

2 Stat. 308 (Chapter 4)

You can view this U.S. Statutes at Large citation at these source(s):

2 Stat. 308

U.S. Statutes at Large

Legisworks

PDF - https://govtrackus.s3.amazonaws.com/legislink/pdf/stat/2/STATUTE-2-Pg308a.pdf

We also found 1 parallel citation:

Pub. L. 8-4

U.S. Law