xviii] MOULD-FUNGI 489 



on to the free surface, e.g., jaw, skin, pharynx, larynx, lung, 

 intestine, an ulcer is established, which, as the infiltration in 

 the periphery proceeds, enlarges. In the discharge of the 

 abscess a number of yellowish minute granules can be found ; 

 these granules looked at under the microscope are a mass of 

 the ray fungus. It has now been established that carious teeth 

 may represent the point of entrance for the fungus ; in these 

 cases the alveolar process of the jaw becomes the place for 

 the growth of the fungus, leading to the formation of a hard 

 tumour, gradually becoming converted into an abscess and 

 ulcer. The infection, i.e. invasion by the fungus, then spreads 

 to the lymph glands and skin nearest to the affected jaw, and 

 here produces tumour, then suppuration and ulcer ; or it 

 invades the tonsils and the pharynx, either primarily or after 

 it has once taken root in the jaw, tongue, or cheek. Or it 

 appears primarily in the larynx, trachea, and lung; in these 

 cases the fungus has evidently been introduced by the air 

 during inspiration. In the case of the lung extensive inter- 

 stitial inflammation is set up, leading to abscesses perforating 

 into a bronchus. Or it invades primarily the alimentary 

 canal and leads here to abscess and copious suppuration, 

 and even to perforation of the part ; in the case of the 

 alimentary canal the fungus may have entered with the food. 

 From the alimentary canal the disease spreads to the mesen- 

 teric glands and the liver ; in this latter organ it produces 

 abscess, which may open through the peritoneum into the 

 peritoneal cavity, or, if previously an adhesion with the 

 abdominal wall had been established, may perforate out- 

 wards. In all these instances the discharged pus contains 

 the yellow granules, i.e. groups of the ray fungus. 



In the case of the skin th-e fate of the tumours is suppura- 

 tion and formation of abscess, and this opening on the 

 surface leads to the formation of a sore. The primary 



