PLATE IV 



FIG. I. Section of the submaxillary gland of the human adult (hematoxylin-eosin, x 125). 



Ewing. 



This figure shows the so-called serous acini, in which the cells are deeply stained ; those 

 with the cells relatively clear are mucous acini ; a number of demilunes are distinctly shown ; 

 near the left lower border of the figure is a cross-section of a small duct, lined with epithelium. 



FIG. 2. Section of the oesophagus of the dog (hematoxylin-eosin), x 10. Author's 

 collection. 



This section shows, at the upper border, the layer of epithelium, deeply stained, resting on 

 a thick corium ; beneath the corium is a layer of mucous glands ; just beneath the glands, the 

 fibrous tissue is plainly shown ; beneath the fibrous tissue is the inner layer of the muscular 

 coat, composed of striated and non-striated fibres, with the outer layer below, deeply stained ; 

 beneath this is the outer layer of fibrous tissue. 



FIG. 3. Section of the stomach (hematoxylin-eosin), x 125. Author's collection. 



This section is from the greater curvature, near the pylorus. The subject was executed by 

 electricity at 6.01 A.M., April, 1905, and the specimen was put into Zenker's solution two min- 

 utes after death. He was twenty-eight years of age, in perfect health and had not taken food 

 for about twelve hours. The negatives for two colors, blue and red, were taken a few days 

 after the section had been cut and stained. 



The figure shows the tubules of the mucous membrane, the acid-cells stained red and the 

 peptic cells, blue; it should be studied in connection with the text in the body of the book 

 (see page 188). 



It will be observed that although the section is near the pylorus, there are many red acid- 

 cells mixed with the blue peptic cells. There are no tubes shown in this figure that contain 

 peptic cells only, although such tubes existed in other parts of the specimen, as well as some 

 tubes nearly filled with acid-cells. 



FIG. 4. Vertical transverse section of the duodenum of the cat (picro-carmin), x 35. 



Author's collection. 



This figure shows above, the csecal ends of the follicles of Lieberkiihn ; below, are Brun- 

 ner's glands and connective tissue ; beneath the connective tissue is a small portion of the 

 .muscular coat. 



FIG. 5. Section of the small intestine of an infant (hematoxylin-eosin), x 125. Ewing. 



This figure shows sections of the villi and of the tubes ; the cells are red and the nuclei 

 are blue ; the great number of circular vacuoles, that are unstained, are the empty portions of 

 goblet-cells. 



FIG. 6. Lower portion of the duodenum of the dog (picro-carmin), x 30. Author's 

 collection. 



This figure shows above, the villi, with the epithelium deeply stained ; below, are the 

 follicles of Lieberkiihn, also deeply stained ; in the submucous tissue, are several glands of 

 Brunner ; the lowest part of the figure shows the muscular coat. The magnification is too low 

 to show the cells distinctly. 



