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POPULAR SCIENCE REVIEW. 
evidence afforded by the collections of Britain, France, and 
Germany. In assigning a specific value to differences between 
Lion and Tiger, we have realised the great amount of variation 
in size and form within the limits of a species, as insisted upon 
by our great philosophic naturalist, Mr. Charles Darwin. A 
minute comparison of the leonine with the tigrine skeletons in 
London and Oxford has resulted in our being unable to perceive 
any constant specific differences except the following, and these, 
moreover, are manifested only by the skulls. 
In the Lion the frontal processes of the maxillaries extend 
at least as far back as a transverse line passing through the 
naso-frontal suture ; their apices are pointed. The inner 
bounding line of the nasal aperture, viewed in front, forms an 
even curve. The frontal ends of the nasal bones are flat. In 
the frontal bones the inter-orbital space is flatter and wider 
than in the Tiger. The temporal length of the frontals is smaller, 
and consequently, the post-orbital process is placed farther back, 
and the forward extension of the sagittal crest is less. The 
comparatively shorter space between the posterior palatal 
foramen and the orbital edge of the palate, when viewed in 
relation to the basal length of the skull, is also to be reckoned 
characteristic. The ramal process is always more or less deve- 
loped on the inferior border of the lower jaw, and invariably 
causes the latter to pass below a plane extending from the angle 
to the symphysis. 
In the Tiger the frontal processes of the maxillary bones 
never extend so far back as a transverse line passing through 
the naso-frontal suture ; their apices are truncated. The 
internal bounding line of the nasal aperture, when viewed in 
front, presents a double curvature. The frontal portions of the 
nasals are bent downwards, so as to form a median depression at 
their symphysis. The post-orbital processes have a larger 
frontal development, and cause the inter-orbital surface to be 
more concave and narrower than in the Lion. The greater 
temporal length of the frontals causes the long-waisted appear- 
ance, and the greater development of the sagittal crest in the 
adult. The posterior palatal foramen is farther removed from 
the orbital edge of the palate relatively to the basal length of 
the skull. The ramal process is invariably absent from the 
lower jaw. The bones of the trunk and the extremities present 
such variations in Lion and Tiger, that they offer no point 
of specific value. 
What, tlien, was the relation which the great Felis of the 
British caves bore to these two animals ? The two nearly perfect 
skulls from the Mendip caves and the one from Sundwig, in 
the British Museum, afford the materials for the answer of this 
question. In all tlie characteristic points of difference above 
