St. Mark's rest : the history of Venice written for the help of the few travellers who still care for her monuments (1885)
Ruskin, John, 1819-1900 · New York : Lovell · leaf 624
g, whenthe active wing is open, the space between it and the body.But the plumes of the two great fans, a and b, are set into thebones; in Fig. 8, faither on, ai*e shown the projecting knobson the main arm bone, set for the reception of the quills,which make it look like the club of Hercules. The… … Fig. 7. 73. The feathers of the fan a are called the primaiies. Thoseof the fan b, secondaries. Effective actions of flight, whetherfor support or forwaid motion, are, I believe, all executed withthe primaiies, every one of which may be biiefly described asthe strongest scymitar that can be made of…
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