EOMLEN ES. 
een ee Se eS han ca cledateeduteecadact 7 
Pen peeme aety SEIN EAMES 555 Ek one ws ne ccncatescecec ccceue 7 
2 ES a Pa ar ae eee 12 
Methods and materials used---..--- LE, OCU NRE» STE GEOR AO ce AON See Sa ee pea 12 
ene iE IEEM MEN ee eee 5% os. on 8 se wd ee ma wate de Se 16 
SE ee es 19 
Development of the pollen tube and prothallus ..---..----22-22.--22..--2--- 22 
Germination of pollen and growth of prothallus -.--........2........--- 22 
Sepereeirce MrmMnTeOMiete Gell 22 22 os oe ee oo eee we aes 5 Se 24 
Appearance and growth of blepharoplasts........-.-----...-----..-.--- 30 
iceewin or mana end of pollen tube... .-.-..-.2-..5-5----55-2--- auakd 33 
SEs Se ES ee ee 39 
TSR ge eee 48 
Structure and form of the mature spermatozoid.................-.---------- 50 
re  EMEMES Soe a= ee eng Santee Saveeswcnes 54 
INI he eo on ans aan owacad San me 63 
ee, LS SE | 69 
ue Pecmise nats CCULFOROME? | 62. 25 look ce 8 ess let e te cece 70 
Ea ee an ee oe ne a deen ae cte ss ees Saeeccoe 81 
eer eat Pca k aaiesalewee spine d-sdsssenass-te'e 87 
2 SS CE a Sa a ee Sn RR pe 93 
