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virtually no literature, save scattered records of fertile crosses 
among sundry species confined in various menageries, and 
these are without interest as bearing on any of the principles 
of hybridism.” 
In opposition to the opinions of the foregoing authorities, I 
think the following examples, collected from various sources, 
or the outcome of personal observations, will be sufficient to 
demonstrate, were such needed, that hybrid offspring can be 
raised between species pertaining to different genera, and even 
between those belonging to distinct families; that hybrids are 
not invariably sterile, their degrees of fertility graduating from 
sterility to almost perfect fertility. Of course one must not 
lose sight of Pallas’s opinion that, in some instances, 
domestication tends to the elimination of sterility ; or Moreton’s, 
that it merely evolves the capacity for being prolific. But the 
following instances are not restricted to menageries, many 
having occurred among animals while in their feral condition. 
The highest section of the Quadrumana is generally con- 
sidered to be the Catarhina or Old World Monkeys, and among 
these are three tribes or families. (1) Semnopithecus, which 
includes: Macacus, has a long tail, cheek pouches and natal 
callosities ; (2) baboons, including Cynocephalus, have short 
tails, large heads, prolonged muzzles, &c., and natal callosities. 
There were confined in one cage at the Regent’s Park Zoological 
Gardens, a male ape, Macacus cynomolgus, from Upper Burma, 
and two female quadrumana, one an adult Mangabey, Cercocebus 
fuligonus, and the other a Mandrill baboon, Cynocephalus 
mormon, scarcely adult. On October 2nd, the Mangabey fell 
down dead from a high perch, and on being dissected, a foetus, 
far advanced in growth, was discovered in her uterus. The 
Mandrill, on October 14th, gave birth to a young one that lived 
until December 20th, 1879. The foregoing are instances of 
hybrids between allied genera, and also between members of 
two distinct families. Blyth recorded in 1863 (Journal of the 
Asiatic Society of Bengal, xxxii. p. 455) a hybrid between a male 
Macacus nemestrinus and a female Cynocephalus porcarius, or a 
long-tailed ape fertilizing one of the baboon tribe, 
