PLATE VI. 



Structure of wall of acinus and of secretion, mature glands of parotid. 

 Vertical section of gland. 



Fig. 59. Walls of adjacent glands and intervening connective tissue. 

 Longitudinal view of muscle fibers. Note stratum of finely granular secretion 

 in right gland, x 280. 



Fig. 60. Walls of adjacent glands and intervening connective tissue. Note 

 the arched appearance of the epithelial nuclei with enclosed clear area. 

 X 280. 



Fig. 61. Parts of three mature glands : granular secretion with globular 

 bodies, peripheral stratum of finely granular secretion, and muscle fibers 

 about central gland. Cutis. X 60. 



Fig. 62. Walls of adjacent glands and intervening connective tissue. 

 Gland to left shows an oblique view of muscle fibers imbedded in matrix, 

 that to right a longitudinal view, x 280. 



Fig. 63. Secretion — finely granular peripheral layer and the coarsely 

 granular, together with a few detached nuclei. (Same as Fig. 67.) X 280. 



Fig. 64. Secretion, x 280. 



Fig. 65. Wall of acinus and secretion. Imbedded in the matrix are 

 several muscle fibers seen in transverse view, two of which show a nucleus. 

 Attached to the inner side of the matrix are three arched, naked, epithelial 

 nuclei. X 670. 



Fig. 66. Wall of acinus near lower pole of mature gland — muscle fibers, 

 matrix, epithelial nuclei, — and secretion, x 280. 



Fig. 67. Shows difference in appearance of secretion in a given gland. 

 X60. 



Fig. 68. Secretion. Black and white dots in the grains represent the 

 refractive bodies. X 670. 



