150 



PHYSIOLOGICAL BOTANY. 



The process of cell division depends first upon the nucleus which forms a 

 spindle of radiating fibrils with an equatorial disk. A middle wall, or parti- 

 tion, is formed at the disk, whereby two distinct cells are produced (477). 

 MadosUe's Elementary Botany. 



477, No. 1, mature cell ; 2, 3, 4, 5, 6, 7, 8 show the changes through which No. 1 passes preparatory to 

 the final act of fission ; seen completed in No. 9. 



382. 5, Budding is another form of plant multipli- 

 cation. In this mode the plant cell puts forth a pro- 

 trusion which enlarges until it is about 



the size of the old cell, when a partition 

 wall is thrown across at the juncture, 

 making the new cell complete and inde- 

 pendent. In Fig. 478 the process of bud- 

 ding is shown in its several forms. 



383. c. Intra-cell Formation. Under undergoing the process 



of budding. 



this head are treated those cases in which 

 several aggregations appear within the cell and the 

 entire mass of protoplasm separates into two, three, or 

 more parts, each of which, either at the time the divi-, 

 sion is going on or soon after, becomes inclosed in a 

 cellulose envelope, and speedily assumes a globular 

 form, as an independent complete cell. 



478 



478, Yeast plant, Sac- 

 charomyces cerivesiae, 





