The protection was originally limited to "transfers of stock or
treasury bonds" (Act 1915 No. 26, sec. 5), but was enlarged, and
the provision enacted in its present form by the Acts 1927 No. 2
and 1932 No. 25. But it is not reasonable to suppose that the
protection, as it now exists, extends to every document referring
to or remotely connected with the transfer of stock or other prescribed
securities. The generality of the exception must be confined by
the purpose of the Act, and read in connection with its other pro-
visions. The Act makes elaborate provisions for the issue and sale
of stock and other securities, for their redemption by purchase, &c.,
for their transfer and transmission, for powers of attorney in relation
thereto, and so forth. Various forms are also prescribed by the
regulations under the Act, all for use in connection with transactions
in, or required to be registered in, the office of the Registrar of
stock. These provisions give a clue to the meaning of the words
"documents relating to the . . . sale transfer or transmission
of any stock or . . . other . . . securities," and suggest
the limitation that should be put upon those words. Shortly stated,
the protection is limited to documents relating to transactions and
registrations recognized by the Act, and documents connected there-
with, such, for instance, as the forms prescribed by the rules. The
purpose of the section is to protect Commonwealth securities from
stamp duties, or impositions other than those sanctioned by the
Commonwealth. But it is not necessary for that purpose to protect
documents effecting mercantile or other contracts in relation to
such stock or other securities, or settlements by parties holding the
same. The settlements here in question do not by their own force
vest any legal right to the stock in the trustee, nor are they recognized
by the Act; they are incapable of registration under the Act, for
they are not in the prescribed form, and disclose trusts which cannot