  Let $B$ be a Blaschke product with zeros $\{a_n\}$. If $B' \in A^p_{\alpha}$
for certain $p$ and $\alpha$, it is shown that $\sum_n (1 - |a_n|)^{\beta} <
\infty$ for appropriate values of $\beta$. Also, if $\{a_n\}$ is uniformly
discrete and if $B' \in H^p$ or $B' \in A^{1+p}$ for any $p \in (0,1)$, it is
shown that $\sum_n (1 - |a_n|)^{1-p} < \infty$.
