282 TEETH AND THE ALLIED Oil GAN S IN MAMMALIA. 
gratuitously placed the extensive cattle lairs ^and market 
area at Islington at the disposal of the Council. This boon 
is rightly considered by the Council as one of which it may 
well be proud, exemplifying, as it does, that the authorities of 
the first city in the world are resolved to do their utmost to 
advance the progress of the profession. The accommo- 
dation is far greater in every respect than can possibly he 
required ; an unlimited number of cattle and sheep will be 
at all times at the command of the examiners, and besides 
this, the nearness of three of the largest horse-slaughterers’ 
premises in the metropolis offers great advantages ; and we 
learn that arrangements have also been completed with 
regard to a supply of horses for the use of the Examiners 
which are most satisfactory. 
Extracts from British and Foreign Journals. 
PROFESSOR FLOWER’S HUNTERIAN LECTURES ON THE 
TEETH AND ALLIED ORGANS IN THE MAMMALIA. 
Delivered at the Royal College of Surgeons of England. 
The formation of the permanent teeth commences at a 
very early period, almost at the same time with that of the 
milk-tooth. The process has been chiefly observed in man. 
A small bottle-shaped mass of cells is cut off from the enamel 
organ of the milk-tooth, and gradually becomes lower and 
lower in position until it is placed below the sac of the milk- 
tooth, to the upper part of which it is connected by a pedicle 
or neck conveying blood-vessels. It was formerly believed 
that the permanent tooth w r as formed in a depression at the 
side of the dental groove ; but this appearance of depression 
was produced by the removal of the epithelium in the process 
of preparation. 
The process of formation of the permanent tooth is the 
same as that of the milk-tooth. The former is, when fully 
calcified, separated from the latter by a thin bony septum. 
When the second dentition is about to take place, the root of 
the milk-tooth assumes a worm-eaten appearance, the depres- 
sions being filled by a highly vascular material derived from 
