EXPLANATION OF THE PLATES. 



PLATE LXL 



Fig. 1. Vessels of thyroid gland. 18 diameters. 



Fig. 2. Vesicles of slightly enlarged thyroid, viewed with 

 a lens only. 



Fig. 3. Ditto of same, magnified 40 diameters. 



Fig. 4. Ditto of same, magnified 67 diameters, showing the 

 fibrous structure of their walls, and their cellular 

 and nuclear contents. 



Fig. 5. Lobes and vesicles of thyroid, magnified 27 dia- 

 meters, as seen in a gland in its ordinary condi* 

 tion. 



Fig. 6. Granular nuclei of vesicles of thyroid. Magnified 

 378 diameters. 



Fig. 7. Two follicles of thymus gland, magnified 33 dia- 

 meters, showing the plexus of vessels which in- 

 vests them. 



Fig. 8. A portion of the capsule of thymus, magnified 54 

 diameters, showing the ternary disposition of the 

 vessels. 



Fig. 9. Granular nuclei and simple cells with fibrous tissue 

 of thymus. Magnified 378 diameters. 



Fig. 10. Compound cells of thymus. Magnified 378 diame- 

 ters. 



