PLATE XXVIII. 



Actinomyces. 

 FIG. i. 



From a section of a maxillary tumour in a cow. 

 Stained by Weigert's method (orseille and gen- 

 tian violet), x 900. 



FIG. 2. 



From a section of the lung of a cow. The rosettes are 

 much smaller, possibly owing to their being more 

 confined by their surroundings than when grow- 

 ing in the soft pulpy tissue of the maxillary 

 tumour. They are here shown with high 

 amplification, but under a power of about 50 

 diam. (Zeiss A.A. Oc. 2) the section of a lung re- 

 sembles miliary tuberculosis, and in the centre 

 of a neoplasm the rosette appears about the 

 size of a pin's head. Stained with Weigert's 

 method (orseille and gentian violet). x 500. 



