52 A HALF-HOUR WITH THE 



at figure 100, and the Botrytis which accompanies 

 the potato disease, figure 101, are other and in- 

 teresting forms of these minute parasites. The 

 common pea is subject to a blight which is ac- 

 companied by a peculiar fungus, seen at figure 102a, 

 which, when examined by a low power, presents a 

 globular mass, surrounded by minute filaments. 

 Under a high power the central ball is resolved 

 into a series of little cases, containing in their 

 interior the minute spores. These are seen at 

 figure 1026. Seeds, as well as fruits, are liable to 

 the attacks of fungi during their decay. Figure 1 03, 

 Plate 4, represents a fungus found in a mould upon 

 a common Spanish nut. This fungus looks like a 

 red powder spread over the surface of the nut. A 

 fungus has been described as attacking the oil- 

 casks in the London docks : its fibres resemble 

 threads of black silk. It is represented at 

 figure 104. The spores are found scattered about 

 the fibres. As we have already seen, fungi are 

 found on the human body, and accompany certain 

 forms of disease of the skin, more especially those 

 of the head. In these cases the fungi insert them- 

 selves into the follicle of the hair, and introduce 

 themselves into its structure, so that it either falls 

 off or becomes disorganized. The fungus of ring- 

 worm, called Achorion Schonlenii, is given at 

 figuie 105. If the seed of wheat is allowed to 

 germinate in a damp place, the little rootlet which 

 it sends down will be found covered over with a 

 minute fungus. A fungus of some interest, on 

 account of its unusual place of growth, may 

 be found, in autumn, attached to the roots of 

 the common duck-weed (Lemna minor), seen at 

 figure 106 plate 4. In the same figure, at a, 

 is represented a fungus of a different kind, it is 

 parasitic within the cells, and has a bead-liko 



