Ltcopodai 



<.llt. 



mid 



oonl [I 



nus 



Dumber in tin- v. I 



tin- ently pn 



'.. In on 

 oel] .11 :i i. tin. illy • 



are probably developed in the •. 

 spore-cell. N 'ii of th 



tin- id. 



in i - idea announced tin: he had 



ilaria, in which the small - 

 which entered i;.' ■ ity on t] 



.Mill his views of imp 

 fter the ripe - lain :i longer or 



oell-formation comm< within • 



spore-cell, whenc the formation of a cellular body occupy 



portion of the internal cavity of the spore. '1 - multiply 



through the ■ eternally as the green cellule 



'1; in '.' 1st by Bis F, the ' papilla of the d 



why this should 1 than as the pro-embrj '.ularia it 



soon seen. — where the pro-embrj ily about th.: 



envi the exine. and where the Oi 



litt!. »,— that the pro-embryo i tral cell 



layer of smaller ones. The smaller cells c 

 cell, four in number, elongate into a papilla before tin- pro-embrj 

 exine, which split- regularly into tweh 



divided by horizontal walls, and then appear as the organ which Schleidi i 

 him MetteniuB, supposed to be pollen-tubes produced from some of I 

 These papilliform cells i - only originate from the pro-embi 



.v all in :• iund from Schlei len's 1 



"Tii'' I rm cells . and leave a 



u-ge central cell. In this cell the young plant 



rich never produce pollen-tub I I the cellule* 



I obs. 

 only four cells. It tely tilled the lai\ 



;'"t the •• vt' a pollen-tubi I it. 



'• The organization of Salvinia is somewhat differi 

 embryo, several, aa many 

 but two to the obtuse triangular cellu 



form, and become filled with : • four cells 



cells h»e the greater part of their chlorophyll, and 



• the large central cell. In ti 



occurrence of poly-embryony in this gemis; 

 ryo in one case. 

 " It is out of the question to talk ofa'l i tube' in S 



lias already -i c\mi that the structure of th< 

 them ini; 



Dr. Metteniue 

 Inns the preceding account in ail 

 only to the structure of the coat 

 development of the " ovules " in the - 

 • !y with that in Pilularia. Eofmeisl 

 the production of cellules cont 

 just as N ,.v them in Pilular 



