CHARMED PARTICLES AND PARTONS

In this Talk I will discuss the following problems:

1) Smallness of the photoproduction cross section of "d! mesons;

2) Estimates of the cross sections of charmed particles production by neutrinos and antineutrinoa with the account of the mass of the charmed quark;

3) The origin of the 6 T=½ rule in nonleptonic decays of strange particles and decays of charmed particles;

4) UpPer bounds on the masses of charmed particles.