_ Beajerr’s earlier researches on the germination of the pollen grin 
in the conifers and the homologies of its organs have been refered 
the equivalent of the mother cell’ of the spermatogenous complet 
This mother cell divides into three cells, of which the two antenor 
function in fertilization while the third is disorganized. In the Cup 
Tessinez, however, the structure of the pollen tube is much simpler, — 
Since there are no fixed cells, the entire prothallium pie Sewn ; 
an antheridium which is like that of the Abietinea. In Taxusa fur 
ther simplification occurs in that.the mother cell in the antheridium 
divides into only two cells of which one is functionless. The partsit 
the angiosperms are essentially as in Taxus.—Cf, Ber. d. deuisch 
Gesells. X1 (1893). 108. 
THE OCCURRENCE and physiological significance of myrosin cl aa 
has been the subject of a research by Wilhelm ark pele 
gsheim’ ite. . (1893). cates el 
published in Pringsheim’s /ahrbiicher, xxv. (1893 a daces, Violt 
thus summarized. Myrosin occurs in the Cruciferae, R e 
eds and vegetativt 
stomata; the roots contain’ no myrosin. In 
Reseda no myrosin tubes could be discovered. In the 
of the vegetative organs the myrosin exists in a dissolve 
in seeds which are poorer in water, it is always in 
