Beer, Development of tlie pollen grain and antker of some Onagraceae. 313 
Fig. 43—45. 
Fig. 46—49. 
Fig. 50. 
Fig. 51 and52. 
Tapetal cells of 0. longiflora to skow ckromidial fibres (f), 
degenerating nnclei (d) and intact nnclei (n). Worcesters 
fluid; metkylene blue and fucksin. 
Interstitial bodies of pollen grain of Gciura Lindheimeri 
sliowing successive stages in its Perforation and dissolution 
by tke advancing intine Fig. 46—48 examined in cklor-zinc- 
iodine solution Fig. 49 stained witb bismarck brown. All 
fixed with Flemming's solution. 
Interstitial body of mature pollen grain of 0. longiflora. Medium 
ckrom-acetic. Bismarck brown. 
Disintegration of special-motker-cell-wall. Oen. biennis strong 
Flemming. To skow tke first-formed lamellae of tke wall 
still left intact whilst tke later-formed layers kave completely, 
broken down. Fig. 51 congo red stain. Fig. 52 corallin soda. 
