814 
BIBLIOGRAPHY. 
the point I wish to make in this connection is that if the space 
referred to had been carefully examined it would have been 
seen that its gingival width was much wider than the table 
width, showing that either the second or third molar—most 
likely the second—was not in a straight line with the axis of 
the jaw, and with the fourth formed a wedge-shaped space for 
the third molar. “ For the past year this tumor had been 
growing ” says the writer. Quite so, when one considers that 
during the same time the third molar was also rapidly growing 
and was making an effort, against great odds, to gain the level 
of the arcade. 
As regards those occurring in older animals I must confess 
having failed to demonstrate any similarity whatever to those 
occurring in connection with dentition. When not caused by 
productive periostitis ( traumatic) the tumefaction could al¬ 
ways be traced to an odontoma or to dental necrosis ( caries, if 
you wish ). In view of their histological characteristics the 
attempt to place all of these tumors among the teratomata is 
hardly justifiable. 
The large number of these cases appearing at the dental 
clinic of this college has been the incentive for a careful re¬ 
search into their origin. It was only after two post-mortems 
(the animals having died from other causes) that the true na¬ 
ture of the abnormality became apparent. With this clue the 
wedged condition of the third molar was always thereafter eas¬ 
ily detected by palpation or inspection in the recumbent posi¬ 
tion, and in trephining a large opening in the tumefaction the 
fang is found to be from 8 to 15 millimeters too long. 
—(L. A. M.) 
BIBLIOGRAPHY. 
Manual of Prescription Writing and Posology. Prepared for Students and 
Practitioners of Veterinary Medicine. By Harry D. Hanson, D. V. S., Associate 
Professor of Theory and Practice at the New York—American Veterinary College. 
Published by the Author, 160 Eldridge Street, New York. 
We had 110 idea that the little book bearing the above title, 
whose prepararion has been so long announced, would prove to 
be such a valuable work when completed. Now, as it lies be¬ 
fore us we find it crowded from cover to cover with innumer¬ 
able tables and statements that should be but are not familiar 
to the practitioner, with the thousands of other things that he 
must familiarize himself with. 
The genesis of the work gives the reasons for and the man- 
