198 Index. 



Races of pigeon, 59, et seq. 



variable, 73 



Rengger on cats in Paraguay, 31 



Reversion, any case of apparent non-inheritance ought to be 



referred to, till the contrary be proved, 22 

 -, also in speaking of variation we ought to take care to 



eliminate the effects of, 20 



, a confusion of Darwin's with regard to, 65 



a known cause, 75 



, chance of, ought to be carefully eliminated in experiments, 



87 



, whether new characters ever arise apart from, 92 



Rock dove. See Dove 



Ruminantia difficult to classify in a regular series, 80 



RUtimeyer on the marsh-hog, 36 



on the differences between the European and humped 



cow, 40 

 on three forms of ox whose bones are found in the Swiss 



lake-dwellings, 41 



Sanson, a polygenist, 3 



on the Mauchamp Merino, 51 



, his new views on the races of domestic pigeon, 67, 68 



Sardinian moufflon, 82 



Selection in domestic animals, what it really is, 21 



in the dog, 30 



in relation to the cat, 31 



in the hog, 3?* 3$ 



in cattle and in domestic animals generally, its nature, 42, 



et seq. 



methodical, 47 



in the pigeon, 63 



in the pea-fowl, 73 



, natural, 14, et seq. 



