"of which...of"

[Barbara Need]

But the two _of_s are different--at least in the example below:

The early mariner is ignorant of the cause  of numerous phenomena.

Barbara

Barbara Need
Etna, NY

On 17 May 2012, at 7:18 PM, Jonathan Lighter wrote:

> Unless I miss my guess, this truly nonstandard construction is usually
> associated with latter-day neophyte writers.
>
> However, here's a 1928 ex. from an academic writer that sailed through
> copy-editing. I assume it was a slip of the pen:
>
>
> 1928 Angelo S. Rappoport _Superstitions of Sailors_ (London: S.
> Paul) vii:
> It may be attributed to three sources, viz.: Firstly, the
> interpretation
> and explanation of numerous phenomena actually observed, but the
> cause of
> which the early mariner was still ignorant of.

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