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resorted to in nature, the new branches afterwards becoming 

 separated from the parent plant. The whole and defoliated 

 stems when burried under three millimeters of earth and kept 

 moist also gave rise to lateral branches, which grew in the 

 normal way, and by rapid growth soon appeared above the 

 soil, the same as in Funaria. The importance of this power 

 of regen eration in nature has already been emphasized in the 

 case of Funaria. 



The Statements in regard to the elongated growth of 

 the new shoots in the dark, with the development of reduced 

 leaves, and the well-marked negative geotropism and positive 

 heliotropisni, hold good here as well as for Funaria, 



BBYÜM ABQENTEÜM. 



The manner of regeneration from the leaves of B. argen- 

 teum is so similar to that already described for B. capillare, 

 that a detailed description will not be necessary. The whole 

 leaves produced protonema from the basal portion, and the cut 

 leaves from all of the cut edges. The character of the 

 growth from the leaf cells was practically the same. The 

 formation of buds occurred in abundance in the light cultures, 

 but none in the dark. The formation of protonema due 

 to the Separation of the leaf from the stem, and not to the 

 mere cutting. 



An abundant protonema production occurred from the 

 defoliated stems, the growth taking place from the region of 

 the leaf axil. The protonema nature was generally suppresed 

 in the dark cultures, only in a few cases long, unbranched, 

 protonema like growths being noted. The protonema in the 

 light produced buds in great abundance, and often as lateral 

 branches of the first cell of the protonema filament. No 

 buds whatever were formed in the dark. The protonema 

 production was called forth by defoliation , since the whole 

 plants only produced rhizoids, and not in the abundance 

 which was noted in defoliated stems. As opposed to the other 

 species studied, the defoliated stems did not produce new 

 shoots as lateral branches , while the whole plants under 



