Note 9 — Chapter XXII · CAUSES OF VARIABILITY.
Reading edition
Bechstein, in his ‘Naturgeschichte der Stubenvögel,’ 1840, s. 238, has some good remarks on this subject. He states that his canary-birds varied in colour, though kept on uniform food.
Reading edition
Bechstein, in his ‘Naturgeschichte der Stubenvögel,’ 1840, s. 238, has some good remarks on this subject. He states that his canary-birds varied in colour, though kept on uniform food.