1768, " " re-enactment of the Act of 1761.
1773, " " perpetual additional duty of £10; total, £20.
1775, Bill to prohibit importation vetoed by the governor (Delaware).
1775, Bill to prohibit importation vetoed by the governor.
1778, Back duties on slaves ordered collected.
1780, Act for the gradual abolition of slavery.
1787, Act to prevent the exportation of slaves (Delaware).
1788, Act to prevent the slave-trade.

[20] From fac-simile copy, published at Germantown in 1880.
Cf. Whittier's poem, "Pennsylvania Hall" (_Poetical Works_,
Riverside ed., III. 62); and Proud, _History of Pennsylvania_
(1797), I. 219.

[21] From fac-simile copy, published at Germantown in 1880.

[22] Bettle, _Notices of Negro Slavery_, in _Penn. Hist. Soc.
Mem._ (1864), I. 383.

[23] Cf. Bettle, _Notices of Negro Slavery, passim_.

[24] Janney, _History of the Friends_, III. 315-7.

[25] _Ibid._, III. 317.

[26] Bettle, in _Penn. Hist. Soc. Mem._, I. 395.

[27] _Penn. Col. Rec._ (1852), II. 530; Bettle, in _Penn.
Hist. Soc. Mem._, I. 415.