90 



A NATU}IALIST*S WAKDERIXGS 



the longitudinal section. Fig. 10. The sHg-Qm is triangular, 

 with its apex dowmvards. There is no nectary. The stigmatic 

 substance hecomes viscid even in the 

 yonng hud j and as soon as the anther has 

 rotated into its nonnal position, it hegins to 

 increase in quantity — the increase is often 

 80 great that it bulges out in front of the 

 rim of the stignm— and, swelling up, flows 

 over into the anther by the canals (seen in 

 Fig, 15), between the column and the edge 

 of the rostellum . Even before the o3,>ening 

 of the flower I have found the external 

 pollen masses on each side bathed with 

 the stignmtic fluid, and already exserting 

 their tubes. These descend by the grooves 

 I have mentioned on Ixtth sides to the 

 stylary eanaU Concomitant with the flood- 

 ing of the anther there has been taking place a slow approxi- 

 mation of the under side of the rosteUum to the lower lip of 

 the stigma, till its lobes finally embrace the rostelhim, bind- 

 ing down the whole anther (Figs. 10, 12), so that when the 



no. 13. — spATHOGumns 



FLICATA SAME AS FIO, 12, 



BKHOVED ; B, 0, 0, AiS IN 

 FICJ, 12. 



mJ4.^SPATHOC}L(mTSrLICATA(FllOJrT Flfl. 15. — SPATHOOLOTTTS PUCATA ; ITJK 

 VIEW) I>TA(3BA1IMAT1C, SHOWrifO APEX OP THB COLU3JH, WITH TUB 



EOrTB TO THE BTYLARY CAXAl. I-OLf-ilfTA REMOTER ; SHOWIKO THE 



TAEEK m P0UJ:S TTBES^ »^ ; A, B, MAHiGTNAt CA^'ALS BETWEEK TB« 



C, F, A8 IH FIO. 10. OOLCMK-WALL Am> THE PLOOil, I, OT 



THE AKTTIER; the BOSTELLCIf, 



act of fertilisation has been completed the stigma is almost 

 obliterated, leaving no room for any foreign pollen to be 

 applied to its surface. The direction taken by the pollen 

 tubes is shown somewhat diagrammatical ly in Fig. 14, The 

 pollen grains of the caudicles of the pollinia remain as a rule 

 unaffect^^d, but, not being at all viscid, they are not easily 



