  The right(left) derivative, $a^{-1},e-$ and $e,a^{-1}-$ isotopes of a C-loop
are shown to be C-loops. Furthermore, for a central loop $(L,F)$, it is shown
that $\big\{F,F^{a^{-1}},F_{a^{-1},e}\big\}$ and
$\big\{F,F_{a^{-1}},F_{e,a^{-1}}\big\}$ are systems of isotopic C-loops that
obey a form of generalized distributive law. Quasigroup isotopes $(L,\otimes)$
and $(L,\ominus)$ of a loop $(L,\theta)$ and its parastrophe $(L,\theta ^*)$
respectively are proved to be isotopic if either $(L,\otimes)$ or $(L,\ominus
)$ is commutative. If $(L,\theta)$ is a C-loop, then it is shown that
$\big\{(L,\theta),(L,\theta ^*),(L,\otimes),(L,\oplus)\big\}$ is a system of
isotopic C-quasigroup under the above mentioned condition. It is shown that
C-loops are isotopic to some finite indecomposable groups of the classes ${\cal
D}_i,i=1,2,3,4,5$ and that the center of such C-loops have a rank of 1,2 or 3.
