8 9 
Fossombronia longiseta , Aust. 
and in the course of five days the more advanced ones had reached a stage 
as seen in Fig. 4, B. Others of the same culture had undergone a nearly 
vertical division of the young germ-tube. The spores sown in the normal 
culture solution did not germinate, owing to the action of Bacteria. 
On October 12 another set of cultures was prepared in which the above 
experiments were repeated, and in addition spores were sown in ordinary 
boiled tap-water and on sterilized soil. This time several spores, after 
a lapse of twelve days, had germinated in the normal culture-solution while 
Fig. 4. A. A young plant grown on a soil-culture, x 300. B, C, and D. Young plants 
grown in water-cultures, x 300. D. Young plant containing within its cells numerous oil-bodies 
(ob) and chlorophyll grains ( c ). x 300. E. Young plant grown on a soil-culture. Twelve days 
old. x 300. F and G. Young plants in which the ‘two-sided’ apical cell ( x ) has appeared. 
Young rhizoid seen in the latter, x 112. H. Cross-section of apical point of an old plant. X560. 
none germinated in the tap-water till the nineteenth day. In a later tap- 
water-culture spores germinated in about half that time. After eleven days 
the young plants had reached a stage represented in Fig. 4, C and D. 
It was thought probable that spores germinating in the various water- 
cultures might show a tendency towards the development of a longer 
germ-tube than occurs in plants grown on soil, but in no water-culture did 
a germ-tube become longer than the one represented in Text-Fig. 4, B. 
Spores sown on sterilized soil germinated much more readily. In one culture 
