  The polarization observed for stars background to dark clouds (Bok Globules)
is often used as diagnostic to study the ongoing star formation processes in
these clouds. Such polarization in the optical have been reported for eight
nearby clouds CB3, CB25, CB39, CB52, CB54, CB58, CB62 and CB246 in one of our
previous work (Sen et. al. 2000). With a view to understand the origin of this
polarization, the the present work attempts are made to look for any possible
relation between this observed polarization and other physical parameters in
the cloud (like temperature, turbulence etc.). The observed polarization does
not seem to be clearly related to the dust and gas temperatures (T_d and T_g)
in the cloud as expected from the Davis-Greenstein grain alignment mechanism
(Davis & Greenstein, 1952). However, the average observed polarization p_av
appears to be related to the turbulence delta V (measured by 12CO line width)
by the mathematical relation p_av=2.95exp(-0.24delta V). The possible realtion
between the direction of polarization vector and other physical parameters are
also discussed. For this analysis, in addition to the data on above eight
clouds, the data on CB4 (Kane et. al., 1995) are also included for comparison.
