1116 
DR. H. WATNEY OX THE MINUTE ANATOMY OF THE THYMUS. 
Figs. 72, 73, 74, 75, and 76. Camera lucida, obj. 8, X 600, oc. Ill, obj. 9. These 
figures show the exact comparative sizes of the outlines of the coloured 
and of the colourless blood corpuscles, and of the Thymic corpuscles in 
the various classes of Yertebrates. 
cb. and cbc. Coloured and colourless blood corpuscles, examined without 
reagent, 
The . Thymic cells, examined in f- per cent, saline solution. 
Fig. 72. From Hay-fish two feet seven inches across. 
Fig. 73. From Frog about one-fourth grown. 
Fig. 74. From Tortoise half-grown. 
Fig. 75. From Pigeon three months old. 
Fig. 76. From Dog eighteen months old. 
Fig. 77. Camera lucida, obj. 7, X 450, oc. III., obj. 8. 
be. Coloured blood corpuscles of adult Camel. 
cbc. Colourless blood corpuscle of the same. 
cl. Large cell, not drawn to scale, containing small oval coloured blood 
corpuscles from the lymphatic gland of the same. 
Fig. 78. Camera lucida, obj. 7, X 450, oc. III., obj. 9. 
Shaken section of medulla of follicle, from thymus of Calf twelve days 
old. 
/. Commencing fibrous-tissue; at this point, the connective-tissue-corpuscles 
are much closer together, and the nuclei are more abundant than in 
other parts of the figure. A little above the middle, three granular 
cells are seen; to the left, connective-tissue-corpuscles forming a net¬ 
work. They are drawn as if they branched only in one plane. 
A few lymphoid cells are seen. 
Fig. 79. Camera lucida, obj. 7, X 450, oc. III., obj. 9. 
Section of medulla of follicle, from thymus of Calf one year old, hardened 
in chloride of gold and chromic acid. 
To show the formation of fibrous-tissue from spindle-shaped cells. 
Figs. 80 and 81. Camera lucida, obj. 7, X 450, oc. III., obj. 9. 
Shaken section of thymus of Calf nearly one year old. 
Fig. 80. From cortex of a follicle. 
v. A blood vessel, with adventitia of newly-formed tissue. 
The network is composed of broad, close!y-meshed connective-tissue. 
Fig. 81. From centre of medulla of a follicle. 
A blood vessel, with adventitia of newly-formed connective-tissue. The 
vessel is unchanged. 
f. Fibrous-tissue attached to the adventitia. 
