[Alamo-Girl]

In other words, he [Darwin] never discussed the subject of "abiogenisis" at all.

Er, beg to differ. Here's a quote from Darwin's letter to Joseph Hooker in 1871. It is used in numerous lecture notes on the internet:

"If we could conceive in some warm little pond with all sorts of ammonia and phosphoric salts - light, heat, electricity present, that a protein compound was chemically formed, ready to undergo still more complex changes, at the present day such matter would be instantly devoured, or absorbed, which would not have been the case before living creatures were formed."

[PatrickHenry]

Er, beg to differ. Here's a quote from Darwin's letter to Joseph Hooker in 1871. It is used in numerous lecture notes on the internet

Yes. (ARRRGH, ya got me!) He speculated in private. Don't we all? But his formal works don't deal with the issue. And "classical" evolution (if I may use that expression) studies the development of life -- however that life first came into existence. [I'll give you a hug anyway.]