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XVII. On the Parasitic Vegetable Structures found growing in Living Animals. 

 By JOHN HUGHES BENNETT, M.D., Edinburgh. (Communicated by Dr GRAHAM.) 



(Read 17th January and 7th February 1842.) 



THAT the eggs of numerous parasitic animals may be deposited in the tex- 

 tures of living beings, and that these develop themselves in such textures, and 

 draw thence their nourishment, has been long known. But that, under particular 

 circumstances, certain cryptogamic plants are capable of germinating and fructi- 

 fying in the living tissues of animals, and especially in man himself, is a discovery 

 of recent date. 



As these growths are not only interesting to the naturalist, but, inasmuch as 

 they are connected with disease in animals, ought to arouse the attention of the 

 pathologist, I was induced to make them a subject of observation, and have now 

 the honour of laying the results before the Society. 



The following are the objects of the present memoir. 



1st, To confirm and extend the observations and experiments of M. GRUBY 

 concerning the mycodermatous vegetations found in the crusts of the 

 disease named Tinea fawsa, or Porrigo lupinosa of BATEMAN. 



2d, To announce the occasional existence, and describe a plant found grow- 

 ing on the lining membrane or cheesy matter of tubercular cavities in 

 the lungs of man. 



3d, To describe the structure of a plant found growing on the skin of the 

 gold-fish. 



And, 4th, From a review of all the facts hitherto recorded in connexion with 

 this subject, to draw certain conclusions respecting the pathological state 

 which furnishes the conditions necessary for the growth of fungi in living 

 animals. 



I. 



Observations on the Mycodermatous Vegetations constituting the crusts of the Tinea favosa, or 



Porrigo lupinosa of BATEMAN. 



In the Comptes Rendus des Seances de 1' Academic des Sciences for July and 

 August 1841, there will be found abstracts of observations made by M. GRUBY on 

 the crusts of the disease named Tinea fawsa, or Porrigo lupinosa, according to 



VOL. XV. PART II. 4 F 



