DR. H. WATNEY ON THE MINUTE ANATOMY OF THE THYMUS. 
1111 
A network, formed of star-shaped cells and their processes, unites the 
blood vessels and the threads, and forms an adventitia to the blood vessels. 
Fig. 26. Camera lucida, obj. 5, X 300, oc. III., obj. 8. 
c. and th. As in fig. 25. 
Figs. 27 and 28. Cortex of follicle, from the thymus of foetus three months old. 
Fig. 27. Camera lucida, obj. 9, X 750, oc. III., obj. 11, immersion. 
The reticulum is seen as a fine network, with deeply-stained, irregularly- 
shaped' nodes ; the lymphoid cells are nearly spherical, and are not so deeply 
stained. 
Fig. 28. Camera lucida, obj. 8, X 600, oc. III., obj. 9. 
The section was somewhat shaken. 
a.a. The nuclei of connective-tissue-corpuscles. 
v. Blood vessel showing two nuclei. 
r. The reticulum which is deeply stained. 
l.c. Lymphoid corpuscles. 
Fig. 29. Camera lucida, simple lens, X 12-J. 
Section through the neck of Chick on the seventh day of incubation. 
c. Medullary canal. 
ao. Aortse. 
Th. Thymus. 
Jv. Jugular vein, behind it is seen the vagus nerve. 
ce. (Esophagus. 
Tr. Trachea. 
Fig. 30. Camera lucida, obj. 8, X 600, oc. III., obj. 11, immersion. 
From thymus of Calf twelve days old. 
ct. Star-shaped connective-tissue-corpuscles. 
c't'. Epithelioid cells. 
To the left of the figure the protoplasmic network has left spaces, which 
are partly filled with large granular spheroidal masses. 
Frg ? 31. Camera lucida, obj. 7, X 450, oc. III., obj. 8. 
Section from thymus of Calf twenty-eight days old. The tissue was 
hardened in osmic and chromic acids. 
Spheroidal cells are seen, partly overlapping one another. The centres of 
the cells are composed of spheroidal granular masses. The nuclei lie at the 
borders of the cell. At (g) there are four nuclei. 
v. Blood vessel. 
r. Reticulum of which only traces are seen here and there. 
Ic. Lymphoid corpuscles. 
Fig. 32. Oc. III., obj. 8, x 400. 
Teased specimen from thymus of Calf one month old. 
Spheroidal cells containing granular masses. 
M DCCCLXXXII. 7 c 
