  Detailed analyses are made on previously published data for multi-walled
carbon nanotubes. The field dependence of the Hall voltage, the temperature
dependence of the Hall coefficient, and the magnetoresistance effect (Phys.
Rev. Lett. 72, 697 (1994)) can all be consistently explained in terms of the
coexistence of physically separated tubes and Josephson-coupled superconducting
tubes with superconductivity above room temperature. The observed temperature
dependencies of the remnant magnetization, the diamagnetic susceptibility, and
the conductance are consistent with superconductivity above room temperature,
but are inconsistent with ferromagnetic contamination. We also interpret the
paramagnetic signal and unusual field dependence of the magnetization at 300 K
(Phys. Rev. B 49, 15122 (1994)) as arising from the paramagnetic Meissner
effect in a multiply connected superconducting network.
