1114 
DR, H. WATNEY ON THE MINUTE ANATOMY OE THE THYMUS 
Fig. 51. Section of thymus of Calf three days old. 
The tissue was hardened in chloride of gold and chromic acid. 
Figs. 52 and 53. From thymus of Calf one year old. 
Fig. 54. Camera lucida, obj. 7, X 450, oc. III., ohj. 8. 
From thymus of Calf nearly one year old. 
Multinuclear masses of protoplasm, at right angles to newly-formed band 
of fibrous-tissue (ct.). 
The protoplasmic masses are arranged so as to leave oval spaces or gaps. 
Fig. 55. Camera lucida, ohj. 7, X 450, oc. III., obj. 9. 
Giant cell with central cavity, from thymus of Calf twelve days old. 
Fig. 56. Camera lucida, ohj. 8, X 600, oc. III., obj. 9. 
Giant cell with various processes, from teased specimen of thymus of Calf 
six months old. 
Fig. 57. Camera lucida, ohj. 8, X 600, oc. III., obj. 9. 
Teased specimen from thymus of Calf one year old. 
Giant cell with processes in various planes. 
Figs 58, 59 a and b, 60, 61, 62. Oc. III., obj. 8, X 400. 
Teased specimens from thymus of a Child. 
Fig, 58. cc. Concentric corpuscle, whose outline only is drawn; it ends in 
a vessel-like prolongation ; the prolongation branches, and at this point 
there is a granular cell. 
Fig. 59 a. Concentric corpuscle, containing a dark mass, which extends down 
the vessel-like prolongation of the concentric corpuscle. 
Fig. 59 b. One of the cells of the periphery of the concentric corpuscle. 
Fig 60. A compound concentric corpuscle. 
In the lower part of the figure, coarse connective-tissue threads. 
Figs. 61 and 62. From the periphery of a concentric corpuscle to show the 
coarse threads with imbedded nuclei. 
Fig. 63. Camera lucida, obj. 5, X 300, oc. III., obj. 8. 
From thymus of Child, stillborn. 
Three concentric corpuscles, connected to one another by fibrillated 
processes, Attached to one of the concentric corpuscles is a long thread, 
v. Blood vessel. 
Fig. 64. Camera lucida, obj, 7, X 450, oc. III., obj. 9. 
Section of thymus of Calf three days old, hardened in chloride of gold and 
chromic acid. 
Two commencing concentric corpuscles. The upper one consists of vacuo¬ 
lated protoplasm containing a granular cell. The two commencing concentric 
corpuscles are united by connective-tissue cells; so that the whole has some¬ 
what the appearance of a vessel containing granular cells, 
