f g_, making the silk thread or line go under each
of them. In the division _c_ put the remainder of the pack.

You then get another pack of cards, at the top of which are to be
three cards, the same as those in the three small divisions: and,
making the pass, bring them to the middle of the pack. Let them be
drawn by three persons; let them shuffle all the cards; after which
place the pack in the division _d_, and tell the parties that the
cards they drew will rise at their command, separately, from the vase.

A confederate behind the partition then gently drawing the line, the
three cards will then gradually appear from the vase; then taking the
cards from _c_, you show that those three are gone from the pack.

The vase must be placed so high that the company cannot see the
inside.

_The Divining Perspective Glass._

Procure a small perspective-glass, wide enough, where the object-glass
is placed, to hold the following table:

+-------+--------+--------+
| 1,131 | 10,132 | 19,133 |
| 2,231 | 11,232 | 20,233 |
| 3,331 | 12,332 | 21,333 |
+-------+--------+--------+
| 4,121 | 13,122 | 22,123 |
| 5,221 | 14,222 | 23,223 |
| 6,321 | 15,322 | 24,323 |
+-------+--------+--------+
| 7,111 | 16,112 | 25,113 |
| 8,211 | 17,212 | 26,213 |
| 9,311 | 18,312 | 27,313 |
+-------+--------+--------+

Take a pack of twenty-seven cards; give them to a person, bid him fix,
on one, shuffle them, and return them to you. Arrange the twenty-seven
cards in three parcels, by laying one down, alternately, on each
parcel; but before you lay each card down, show it to the person,
without seeing it yourself. When you have completed the three parcels,
ask him at what number, from one to twenty-seven, he will have his
card appear, and in which heap it then is. You then look at the heap
through your glass; and if the first of the three numbers, which
stands against the number it is to appear at, be one, put that heap at
top; if the number be at two, put it in the middle; and if it be
three, put it at the bottom. Next divide the cards into three heaps,
in the same manner, a second and third time, and his card will be at
the number he chose.

_Example._--Suppose the person wishes his card to be the twentieth
from the top; and the first time of making the heaps, he says it is in
the third heap; you then look at the table in the perspective, and you
see that the first figure is two; you, therefore, put that h