Jour. R. Micr. Soc., 1897. Pl. II. 
Fig. 1. — From developing Tooth of Embryo Lamb, x 150. 
a. Cells of stratum intermedium. The “ stellate reticulum ” has disappeared and the 
epithelial cells of the outer tunic of the enamel organ have united 'with those of the 
stratum intermedium, and both are more or less regularly arranged about the blood-vessels. 
b. Membrane-like structure, to which I have given the name “ outer ameloblastic 
membrane.” A similar structure is shown at d, bounding the inner ends of the amelo- 
blasts. e. Ameloblasts. e. Enamel, f. Dentine, g. Odontoblasts. 
Fig. 2— From section of persistently growing Incisor of Rat. x 400. 
a. Cells of the stratum intermedium, arranged in the form of papillse about capillary 
loops, b. Ameloblasts. c. Partially decalcified enamel, torn and showing fibrous 
character. 
Jour. R. Micr. Soc., 1897. Pl. III. 
Fig. 3. — From section of developing Tooth of Lamb, x 800. 
a. Stratum intermedium, b. Outer ameloblastic membrane, c. Inner ameloblastic 
membrane, d. Large globular masses of the albumen-like calcific-bearing material. 
e. Enamel. /. Dentine. 
Fig. 4.— From section of persistently growing Incisor of Rat. X 600. 
a. Ameloblasts. b. Outer layer of enamel, showing .fibres passing in two direction^ 
c. Showing fibres descending and twisting about each other to form stroma of enamel 
rods. 
