Lead king, in plain suits.
On the appearance of the ace, the leader is marked with queen and at most two small.
In trumps, lead lowest.
Granted that the third player will not trump an honour led originally (and he will seldom lose by passing, even if weak in trumps), the foregoing leads are clearly advantageous, as they enable the third player to employ the unblocking system, and assist him in counting his partner's hand.
The mode of leading, here set forth, has been tried by a number of good players, and has been generally approved. It is, therefore, strongly recommended to the consideration of advanced players, assuming always that the leader's partner is himself an advanced player. Notwithstanding the strong opinion in its favour entertained by the Author, it is still retained in an Appendix, that it may be tested by further trial before being positively asserted as a substantive part of the game.
FOOTNOTES:
[48] "Whist Developments" by "Cavendish." London: Thos. De La Rue and Co.