370 0N FAIRY AlMfCl. 



Three other champignon are most regular. There are, however", a» 



thT^e^ffect mart y as *h rec other fungi that exhibit the same mode of 

 extension, and produce the same effect upon the herbage. 

 These are the ag. terreus, ag. procerus, and the lycopcrdon 

 bovfstti) the last of which is far more common than the two 

 last mentioned agarics. 



Confirmation of There is one circumstance that may frequently be ob- 

 served respecting these circles, which can satisfactorily be 

 accounted for, according to the preceding hypothesis of 

 the cause of their increase, and may be considered as a con- 

 firmation of its truth. Whenever two adjacent circles are 

 found to interfere, they not only do not cross each other, 

 but both circles are invariably obliterated between the 

 points of contact : at least in more than twenty cases, I 

 have seen no one instance to the contrary. The exhaustion 

 occasioned by each obstructs the progress of the other, and 

 both are starved. 



EKffeient fungi I think it also not unworthy of observation, that dif- 



stop the pro- f eren t species of fungi appear to require the same nutri- 

 Ijress of each l - . - ^ . . ~ 



«ther~ ment; for in a case of interference between one circle of 



puff-balls and another of mushrooms, they did not in- 

 tersect; but I cannot say positively that I have seen more 

 than one instance. 



I once found that a tree had interrupted the regular pro- 



Circ»€ inter- 



rupted by i gress of a circle ; but this appeared to be only a temporary 



tree, 



impediment, as the extension had proceeded at the usual 

 rate, and by passing obliquely from each side into the soil 

 beyond the tree, had given the ring the form of a kidney, 

 so that another year or two would probably reunite the two 

 extremities into one curve surrounding the tree. 

 Ii>s-awn will Being desirous of ascertaining in what length of time a 

 xiot vegetate go ii might again recover the power of producing a fresh 



ipo^foTsome cr0 P of fun g* ! ? I cut a g roove ? in one or two instances, 

 time. along the diameter of a mushroom-ring, and inserted a 



quantity of spawn taken from its circumference, with the 

 hope of seeing it vegetate for some distance near the centre ; 

 but the experiment failed altogether : and as I shortly after 

 quitted my residence in the country, I had no opportunity 

 of repeating the experiment, and must leave it to be pro- 

 secuted by those who are more favourably circumstanced. 

 ** IX. Account 



