24 NATURE OF CAPITAL AND INCOME [Crar. IT

nizing the wealth lying behind property in some of its sublimated
 forms.

§5

In order not to devote too much space to this subject
the best procedure will be to give types of the chief forms
of property, and to specify in each case what wealth underlies
 the right. This is done in the table on pages 26 and
27, which also specifies the services involved, and (where they
exist) the certificate or written evidence of the property
right.
§ 6
Probably ninety per cent of the actual property in, the
United States would be included under the cases entitled
Fee Simple, Partnership Rights, Stocks, Bonds, Notes, and
Lease Rights. In all of these cases, the existence of the
real wealth behind them is well known and acknowledged.
For practical purposes, therefore, the proposition that
wealth and property are coextensive is already established.
Of the remaining cases some seem a little obscure at
first, but they may be readily solved if we bear in mind a
few general principles:
The first thought which should guide us is that, given
any particular property right, we should first discover the
benefits or “services” secured by that right, then the physical
 means by which those services are obtained. These
means are not always identical with the “cause” of those
services. For instance, real estate with a southern exposure
 is especially desired because of the sunlight which
falls upon it. The sun may be called the cause of the sunlight,
 but the land is the practical means of obtaining it.
To own or not to own the land is to obtain or not to
obtain the sunlight which goes with it. It is the land which
puts the sunlight at the disposal of its owner. On the other
hand, when a lamp gives its light it is not only means, but
also cause. :