THE EAR-FUNGUS. 



261 



small spores (r), which in the stage of development (B) have a 

 diameter of 0-0042 mm., if not so mature they arfe smaller, 



in A 0-003 mm. The mature, perfectly spherical spores have a 

 very thick contour, and are only a little more transparent in the 

 centre. They range themselves in rows joined to one another, 

 and radiate from the placenta. From this arrangement, 

 Micheli conceived the name Aspergillus (Aspersorio = holy-water 

 sprinkling.) Pacini wondered that neither Mayer nor Robin had 

 represented this arrangement, but the spores are dispersed and 

 the placenta is sown over with them, and believes that if it does 

 arise not from inaccuracy of delineation, that certainly different 

 species are treated of by Mayer and himself. But if perfect 

 maturity has occurred the spores disunite themselves spontane- 

 ously, which, in example A amount to about 19,000, is 

 deceiving. 



The caules the filaments, which form the stalk, present the 

 appearance and size of a large elementary nerve-fibre of the frog 



