148 



PARASITICAL GROWTHS ON LIVING ANIMALS. 



herent to these filaments, similar to the spores of Torula olivacea, 

 and T. sacchari* The form of these filaments, is considered by M. 



Portion of Epidermis. 



TcToo- 



of an inch each. 



Gruby a sufficient proof of their vegetable character, and according to 

 M. Brogniart they belong to the group of My coder mata. 



Each crust of Tinea is described by M. Gruby to consist of two 

 envelopes, formed by the cuticle, and an aggregation of Mycodermata, 

 which are enclosed within them like fruit in their pericarps. The 

 crusts are placed on the surface of the true skin, and the Mycodermata 

 are developed among the cells of the epidermis. 



The external disc of the capsule, which at the commencement is not 

 perforated, becomes open in the centre by a small hole, whose borders 

 are elevated, by the continual development of the Mycodermata. This 

 opening enlarges by degrees, and there is thus formed in the centre a 



* Icones fungorum hucusque cognitorum. A. C. J. Corda, Pragae, 1837, 1840. 



[The above figures, copied from the drawings of Mr. G. Busk, are engraved on 

 copper, by Mr. J. Shury, Jun., of 13, Charterhouse Street. We were desirous of 

 giving the process a trial, as it appeared to us peculiarly applicable to the illustra- 

 tion of such structural subjects. Here is the result ; we leave our readers to form 

 their own opinions as to its merits or demerits. Editor.'] 



