certain caterpillars.
Ring-ouzel, colours and nidification of the.
Ripa, Father, on the difficulty of distinguishing the races of the
Chinese.
Rivalry, in singing, between male birds.
River-hog, African, tusks and knobs of the.
Rivers, analogy of, to islands.
Roach, brightness of the male during breeding-season.
Robbery, of strangers, considered honourable.
Robertson, Mr., remarks on the development of the horns in the roebuck
and red deer.
Robin, pugnacity of the male; autumn song of the; female singing of
the; attacking other birds with red in their plumage; young of the.
Robinet, on the difference of size of the male and female cocoons of
the silk-moth.
Rodents, uterus in the; absence of secondary sexual characters in;
sexual differences in the colours of.
Roe, winter changes of the.
Rohfs, Dr., Caucasian features in negro; fertility of mixed races in
Sahara; colours of birds in Sahara; ideas of beauty amongst the
Bornuans.
Rolle, F., on the origin of man; on a change in German families settled
in Georgia.
Roller, harsh cry of.
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