Sentence:  A short sketch, such as Mr. [Cholmondeley] Pennell's, of the economy of the Bird, would be a most valuable addition to our ordinary ornithologies and <WSD>oologies</WSD>. He said <WSD>oologies</WSD>, for even in the egg of the bird the special needs of the forthcoming bird seemed to be more especially provided for than in the eggs of other families much higher in the scale. 
Meaning of the word marked with <WSD> tags:  The study of birds' eggs. (from 19th c.)