EXPLANATION OF THE PLATES. 



PLATE III. 



Fig. 1. From • the point of a branchial cartilage of Etana 

 esculenta. The lower margin of the delineation 

 exhibits the natural border of the cartilage. 



2. Cartilage from the ilium of a foetal pig five inches 



long, after the application of acetic acid. 



3. Enamel fibres from immature teeth of a fcctal pig. 



I. Cells from the surface of the enamel membrane. 



5. Fibres which compose the substantia propria of the 



human tooth, isolated by maceration for two days 

 in dilute hydrochloric acid. 



6. Fibre-cells from the areolar tissue lying beneath the 



superficial muscles of the neck of a foetal pig mea- 

 suring seven inches. 



7. A more fully developed cell of areolar tissue. 



8. Cells from the gelatinous substance between the cho- 



rion and amnion of a foetal pig seven inches long. 



9. Larger and very pale cells from the areolar tissue of 



the orbital cavity of the same foetus. 



10. Fat-cells from the cranial cavity of the young of 

 Cyprinus erythrophthalmus. 



II. Fibre-cells from the tendo achillis of a foetal pig three 



and a half inches long. 



12. From the middle coat of the aorta of a foetal pig 



measuring seven inches in length. 



13. Cells from the interior of the quadratus lnmborum 



muscle of a foetal pig three and a half inches Ion. 



