DR. E. KLEIN ON THE SMALLPOX OE SHEEP. 
247 
cells. In the deepest layer are seen conical or cylindrical processes 
composed of young epithelial cells (E), which penetrate into the 
papillary tissue of the corium, in which dilated blood-vessels and 
cellular elements may also be observed. , 
D. Middle horny stratum connected by pillar-like processes with the inter- 
papillary processes of the deep rete Malpighii. The cells below the 
middle horny stratum contain series of granules of an arrangement and 
distribution similar to those represented in fig. 4. Some cells imme- 
diately below D are seen to be enlarged, dropsical, and in a state of 
vacuolation. The interpapillary epithelial processes and the papillae 
are much enlarged. 
PLATE 31. 
Fig. 7. Section through a primary pustule 24 hours old, in which are seen transverse 
sections of lymphatic vessels (A) of the deep layer of the corium, as well as 
the interfascicular lymph-channels (B) containing connective-tissue corpuscles. 
The lymphatics are filled with zooglcea. (Oc. 3, obj. 7.) 
Fig. 8. Similar preparation. (Oc. 3, obj. 7.) 
A. Lymphatic vessels containing granular material (zoogloea) and a fila- 
mentous substance (necklaces of Micrococci). 
B. Interfascicular lymph-canaliculi, in connexion with the lymphatic 
vessels, and containing connective-tissue corpuscles. In I. a blood- 
vessel (C) is seen to penetrate a lymphatic vessel (perivascular lym- 
phatic) ; in II. a valve D is represented. 
Fig. 9. Similar preparation from a pustule about 60 hours old. (Oc. 3, obj. 7.) 
A. Lymphatic vessels lined with endothelium, like those in previous figures. 
I. contains lymph-corpuscles, zoogloea, and filaments, the last men- 
tioned being in II. much more numerous. 
Fig. 10. Sections of lymphatic vessels lined with endothelium. Mycelium is seen to 
be contained in them. Nos. I. & V. are drawn with Hartnack’s oc. 3, obj. 8 ; 
Nos. II., III., and IV. with oc. 3, obj. 7. 
I. Part of subcutaneous lymphatic of a pustule about 60 hours old. 
II. & III. Lymphatics of corium of a pustule of the same period. 
IY. & Y. Preparations from a similar pustule. 
PLATE 32. 
Fig. 11. Section through lymphatic vessels of the deeper layer of the corium of a primary 
pustule 30 hours old. (Oc. 3, obj. 11, immersion.) 
In both A & B the conidia of the mycelium represented in fig. 10 and the 
proliferation of the spores may be seen. 
2 l 2 
