THE PILOBOLUS GUN AND ITS PROJECTILE j^ 



the air {vide infra), and the projectile, after landing, has the appear- 

 ance shown in Figs. 33-35, 



An upper view of two projectiles which have settled on glass is 



Fig. 33. — Pilobolus longipes. Pliotoinicrograph of the upper side of a discharged 

 sporangium and of the drop of cell-sap (now dried) which accompanied it. The 

 projectile struck and stuck to a sheet of glass. No. 1, the precipitate of the 

 cell-sap, in part crystalline ; No. 2, a broad ring-layer of jelly in contact with 

 the glass ; No. 3, the peripheral part of the sporangium-wall which is now 

 radially split and flattened out above the ring of jelly, isolated bits of it can be 

 seen at the periphery of the drop to the left ; No. 4, the convex, very black, 

 main portion of the sporangium-wall covering many thousands of spores ; 

 No. 5, two of four spores which were forced out of the sporangium as this struck 

 the glass. Magnification, 51. 



shown in Figs. 33 and 34. Here one can distinguish : No. 1, a 

 precipitate of amorphous granules and small crystals produced by 



