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POPULAR SCIENCE REVIEW. 
it naturally comes first. The author, in classifying tlie mammals, follows 
De Blainville’s system, and divides them into Monodelphia , Didelphia, and 
Ornithodelphia , the two latter representing respectively the marsupialia and 
monotremata, and the first including the remaining mammals. Of the 
principal mammalia he takes the following views. He places the Edentata 
quite hy themselves, as a low order of the mammalian division. The 
Primates include man and all monkeys, and with some doubt he places 
also among this group the Lemurina. Next the Chiroptera , or hats. Then 
the Insectivora , or hedgehogs, shrews, moles, &c. The Carnivora he divides 
into Fissipedia, including the cats, dogs, hears, and their various modifica- 
tions, and the Pinnipedia , including the seals, walrus, and eared seals, or 
sea-lions, as they are termed. The Cetacea contains two sub-orders — the 
Mystaceti, or whalebone whales, and the Odontoceti, including the cachalots, 
narwhals, dolphins, and porpoises. Then come the Sirenia, including the 
manati and dugong. Next the TJngidata. These he divides into the 
Perissodactyla, or odd-toed, containing the horse, tapir, and rhinoceros, and 
the Artiodactyla , which he subdivides into four sections — (a) the non- 
ruminating, including the pigs, peccaries, and hippopotamus ; (b) the 
cushion-footed, or Tylopoda , the camels, and llamas ; (c) the Tragulina , a 
group of little deer-like animals, formerly placed with the musk-deer ; 
( d) the Pecora, including the deer, giraffes, antelopes, sheep, goats, and 
oxen. Next comes the order Hyracoidea, including alone the genus Hyrax. 
Then the Proboscidea , including the Asian and African elephants ; and, 
lastly, the tenth order, the Podentia, embracing the hares, rats, guinea- 
pigs, porcupines, beavers, squirrels, &c. The animals in the two other 
divisions we have already stated. On the contents of the volume it is 
as unnecessary as it would be out of place for us to enter. It is ad- 
mirably lucid and wonderfully condensed. The section on the skull is a 
marvellous chapter ; it contains so much in so little space. The illustrations 
are remarkably clear, and b#ve most of them been drawn for the present 
work 5 they are 126 in number, and they very fairly represent the osteology 
of the whole mammalian group. We hope the book may have a large 
sale, for it is literally the only thing of its kind in our language. 
have had more than enough of treatises on Natural Philosophy; 
Yet we have had very few to which we have been able to award 
even the most distant praise. Here is another treatise adapted, it is said, 
for the use of schools and junior students, and what shall we say of it P In 
the first place, we must observe that it is adapted to the use of schools 
alone. As a book for students — such for instance as first year’s university 
men — it is quite unsuited to the end ; it is a thousand times too simple 
and elementary. For schools, however, we think it a very good book, 
* Elementary Natural Philosophy ; being a course of nine Lectures specially 
adapted for the use of Schools and Junior Students.” By J. Clifton Ward, 
F.Gr.S. London : Triibner, 1871. 
NATUKAL PHILOSOPHY.* 
