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In this paper, we derive an asymptotic approximation to the eigenvalues ofthe linear differential equation $$ -y"(x)+q(x)y(x)=\lambda y(x), x\in (a,b) $$with boundary conditions of general form, when $q$ is a measurable functionwhich has a singularity in $(a,b)$ and which is integrable on subsets of$(a,b)$ which exclude the singularity.

A note on a paper of Harris concerning the asymptotic approximation to  the eigenvalues of $-y"+qy=\lambda y$, with boundary conditions of general  form