PLATE X 



FIG. i. Muscular tissue of the pig, injected, x 125. Author's collection. 



This figure shows the arrangement of the small arteries and capillaries. The magnification 

 is too low to show the structure of the muscular fibres. 



FIG. 2. Cross-section of the human radius from a young adult, injected, X 125. Author's 

 collection. 



Nearly in the centre of this figure is an Haversian canal surrounded with lacunae and cana- 

 liculi, all filled with red material. 



FIG. 3. Section of the finger of a child (hematoxylin-eosin), x 10. Author's collection. 



This section shows bone-development. To the left, deeply stained, is the forming bony 

 structure invading the cartilage ; to the right are the cartilaginous articulating surfaces of the 

 phalanges ; next the sides of the developing bone is periosteum ; the epidermis and corium 

 are shown at the top of the figure ; the magnification is too low to show the cartilage-cells. 



FIG. 4. Section of the ear of a bullock (hematoxylin-eosin), x 125. Author's collection. 



This section shows cartilage-cells, the nuclei rather deeply stained, surrounded with a retic- 

 ulum of very fine elastic fibres. These fibres are most distinct at the upper part of the figure. 



FIG. 5. Transverse section of the Fallopian tube of the rabbit (hematoxylin-eosin), X 10. 

 Author's collection. 



The folds of the mucosa are shown about the horizontal diameter of the figure, the cells 

 being rather more deeply stained than the submucosa, which is not sharply differentiated ; the 

 magnification is much too low to show the structure of the cells ; the muscular layers are 

 stained red. 



FIG. 6. Section through the thorax of the foetus of the Guinea pig, showing especially the 

 placenta and membranes (hematoxylin-eosin), x 4. Author's collection. 



The placenta is to the right of the figure and occupies about one-third of the circumference 

 of the section ; internal to the lower half of the placenta is a portion of detached chorion, 

 showing, under higher magnification, chorionic villi ; the inner membrane, lining that portion // 

 of the ovum not occupied by the placenta, is the amnion ; the outer layer of the section is the 

 uterine wall ; between the placenta and the uterine wall, slightly separated, is the decidua. 



The section of the foetus shows the body of a vertebra and the spinal canal at the top of 

 the figure ; below this is the single aorta ; below the aorta and between the lungs is the oesoph- 

 agus ; by the sides of the aorta and oesophagus are the lungs, with the primitive bronchia, 

 the one to the left more clearly shown ; a portion of the liver lies below the lungs, but the 

 liver has been broken in the section and a great part is lost ; the process on the left of the 

 foetus is the forearm. 



The parts of the foetus are shown more clearly in the human sections, in Plate XVI. 



