Help! - Schodde translation?

Greetings, all!
	For a little light reading over the summer break, I'm into 
the opening chapters of Schodde & Mason's "Directory of Australain 
Birds: Passerines". However, there are a couple of paragraphs over 
which I've spent quite a time -- & still can't decipher them... Can 
anyone translate them into plain English for me? They are, in the 
Introduction:
- p.4, the sub-paras numbered (1) & (2).

I worked my way well enough into the comparisons drawn in para (1), 
but when it came to doing the multi-level comparison with & within 
para (2) -- well, I just can't get it, even with reference to the 
main  text.
Any help appreciated.
Thanks,
Judith.
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