23O APPENDIX. 



Aspergillus flavus. Gold-yellow, greenish and 

 brown tufts ; fruit heads round ; yellow, olive-green, or 

 brown. Conidia round, seldom oval ; sulphur-yellow to 

 brown in colour, '005 '007 mm. in diam. Saprophytic 

 in man, pathogenic in rabbits. 



Aspergillus fumigatus. Greenish, bluish, or 

 grey tufts. Fruit heads long and conical. Conidia round, 

 seldom oval, smooth, mostly pale and colourless. Diam. 

 0025 to "003 mm. Observed saprophytically in human 

 lungs, external auditory meatus, and middle ear. The 

 spores introduced into the vascular system of rabbits, or 

 into the peritoneal cavity, establish metastatic foci in the 

 kidneys, liver, intestines, lungs, muscles, and sometimes in 

 the spleen, bones, lymphatic glands, nervous system, 

 and skin (Plate XXX.). 



Aspergillus niger (Eurotium aspergillus niger, De 

 Bary). Dark chocolate-brown tufts. Conidia round, 

 black-brown, or grey-brown, when ripe ; '0035 to '005 mm. 

 This mould can be cultivated readily on bread moistened 

 with vinegar, on slices of lemon, and on acid fruits and 

 liquids. It flourishes best of all, according to Raulin,* 

 in a liquid of the following composition : 



Grammes. 



Water ...... 1500 



Sugar-candy. .... 70* 



Tartaric acid .... 4* 



Nitrate of ammonia ... 4 



Phosphate . . . . . *6 



Carbonate of potassium ... '6 



magnesium . . -4 



Sulphate of ammonia . . . "25 



zinc . . -07 



iron . . -07 



Silicate of potassium . . . -07 



It was also found that the fungus grew best when the 

 liquid was spread out in a layer 2 or 3 cm. in depth in a 

 * Duclaux, Health Exhibition Handbook, London, 1884. 



