Quarterly journal of microscopical science . visible. In the protoplasm of the epithelial cells there are noinclusions. Zenker formol. Same stain and magnification as in fig. 21. Fig. 23.—Part of longitudinal section of the rectal gland. The entranceof the trachea between the cells of its external layer and the formation oflateral transverse branches of the trachea under the surface of the glandare visible. Zenker formol; iron haematoxylin. Zeiss ; Jg horn, imm.,oc. 4. Fig. 24.—Network of tracheae under the surface of the inner wall of therectal gland. Same treatment. Zeiss ; ^ horn. oc.
Quarterly journal of microscopical science . visible. In the protoplasm of the epithelial cells there are noinclusions. Zenker formol. Same stain and magnification as in fig. 21. Fig. 23.—Part of longitudinal section of the rectal gland. The entranceof the trachea between the cells of its external layer and the formation oflateral transverse branches of the trachea under the surface of the glandare visible. Zenker formol; iron haematoxylin. Zeiss ; Jg horn, imm.,oc. 4. Fig. 24.—Network of tracheae under the surface of the inner wall of therectal gland. Same treatment. Zeiss ; ^ horn. oc. 1. Fig. 25.—Part of surface section of the exterior wall of the rectal running between the cells are visible. The surfaces of the latteradjacent to them stain sharply black. Same treatment and magnificationas in preparation no. 23. Fig. 26.—Cuticle of the epithelium of the small intestine with numerousbacteria on its surface. Zenker formol ; Giemsa. Zeiss ; ob. y\, oc. 4. Quart. Joum. Micr. Sci. Vol. 66, , PI yr&
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