64 



RESEARCHES ON FUNGI 



Fig 



26. — Experimental chamber used for finding the greatest height of projection 

 of the sporangia of Pilobolus longipes and of P. Kleinii. A, a case constructed 

 of beaver-board and wood, the upper part of which, a, can be moved up or 

 down about the lower part, b, which it partly encloses and conceals. B, a panel 

 which has been removed from the base of A, so as to show the culture-dish 

 containing horse-dung balls beset with Pilobolus fruit-bodies. C, three 

 Pilobolus loyigipes fruit-bodies which were looking upwards on the dung-balls 

 in the dish at the base of A : in one fruit-body the long basal swelling at the 

 base of the stipe can be seen. In the roof of the case A is a large circular 

 aperture, h. D, a circular sheet of glass which can be set over the top of A so 

 as to cover the aperture and catch any projectiles which may strike it from 

 below. E, a piece of beaver-board with a central rectangular aperture h over 

 which can be set a rectangular sheet of glass. E can be used instead of D to 

 cover the aperture in the roof of A and catch projectiles. When E has been 

 set on the top of A, light is reflected vertically downwards through its sheet of 

 glass by means of a mirror. The vertical section F shows in detail how the 

 light is reflected : a, a window facing a clear sky ; 6, black paper ; c, a block of 

 wood to which is fixed (by lateral attachment not here shown) the mirror d 

 which reflects light, as shown by the arrows e e, through the sheet of glass, i, 

 at the top of the case vertically downwards to the Pilobolus fruit-bodies on the 

 dung in the dish ; /, a cardboard box open above and below (shown separately 



