EXPLANATION OF THE PLATES. xv 



Fig. 5. Hair with Favus Fungus : Achorion Schonleinii. 



a, b. Groups of spores projecting on the surface of the hair. 



e, e, i. Rows of spores, which anastomose or appear 'bri the surface of the hair. 



d. Special forms of spore. 



e,f. Spores on the hroken-up root of the hair. 



g, h. Broken-up root of the end of the hair with spores amongst the lamellae. 

 6. Crust of skin taken from the neighbourhood of a favus crust. 



a. Opening in the skin of a sebaceous gland, or of a fine hair-follicle. 



,/. Spores adhering to the lamellae of the skin. 

 , 7. Favus crust of the natural size. 



a. Small favi, four in number, each penetrated by a hair. 



6. The same seen from beneath. 



e. A crust with concentric layers penetrated by three hairs. 

 d. The same seen from beneath. (Fig. 5 7 after Robin.) 



8. Network of threads of the thallus of achorion, after Wedl. 



,, 9. The same spores in various forms, after Wedl. 



10. a, b, c. Various thallus threads, after the same. 



,, 11 a. Transverse section through the middle of a small crust of favus, four times 



magnified. 

 b. Spores germinating on an apple. (Remak.) 



PLATE (TAB.) IV. 



1. A hair from a favus treated with alkali, and with gas in the interior. 



2. The same with thallus threads (450.) (Wedl.) 



3. Thrush-fungus = Oidium albicans. 



a. Fragment of a separated thrush layer implanted in masses of epithelium. 



b. Spores. 



d. Thallus threads with partition-walls. 



e. The free end of a thallus thread somewhat swollen. 



g. The same as before with constrictions, without partition-walls. 



4. Part of an aphthous crust cut off on the third day of the disease, formed of epithelial 



cells and masses of spores proceeding from a single thallus. 



5. Perfectly developed thallus threads of Oidium, with partition-walls and 



constrictions (a, a), which at the end of the tubes become coarser (), with fine 

 granulations (c), and in parts ramifications (d), and with small fresh branches. 

 The origin of the thallus is situated sometimes in a spore heap (b~), and begins 

 from an elongated spore (g}, the free end is sometimes swollen (i) and pre- 

 viously notched (). Spores, which germinated on a piece of aphthous mem- 

 brane preserved on a moistened glass (h). 



6. Ends of perfectly developed thallus threads (460). 



7. The same under a higher magnifier (780). 



8. Filaments with granulating cells (a), and without granulations (, c), from the 



aphthous membrane of an adult. (Fig. 3 8, after Robin and Wedl.) 



