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THE ENAMEL ORGAN. 67

considerable portion of the enamel has been formed ; they appear to
have been lost in the connective tissne which is evervwhere above them.
The origin of the enaind organs of tlie permanent teeth may be de-

Frc. 4S.

v\^jMwaji)

,.J
"

Section of incisor of rat ( ' 175): a, blood-vessels with eorpuseles in situ; h, Ijraiieh of same de-
scending to supply capillary loops about secreting papilla; c, ameloblasts. (Dr. J. LeoQ
Williams* specimen.)
scribed in general as follows : From the neck of the enamel organs of
the twenty deciduous teeth, midway between the stratum Malpighii and
the temporary enamel organ, growths in the form of buds are being

Fig. 49.

Section of incisor of rat (X 80): a, capillary loops torn out of secreting papillae; b, .secreting
papillpe after removal of capillary loops; c, ameloblasts; d, enamel; e, dentin. (Dr. J. Leou
Williams" specimen.)

formed, increasing in length, and these result in the formation of the
enamel organs of the ])ermanent teeth, their grow^th taking place on
the lingual surface of the temporary teeth. Soon after this, tlie tern-