266 
Note. 
jar on a window ledge. They gradually established themselves, growing forward 
quite normally, broadening, and deepening the colour as they grew. By July, young 
plants began to appear, which showed their second leaf in August. I then made 
a second transplantation with a similar result. 
The original stock in the glass basin was replaced in its old situation on the shelf 
in order to discover how long the prothallia could retain their vitality under these 
conditions. 
I am now able to state that some of these prothallia have remained alive through 
the years 1915-16-17 into the current year, that is, for nearly six years from the sowing 
of the spores. They have gradually languished, however, and many have died off 
altogether, but even last spring I found young antheridia immediately behind the 
apices of the surviving prothallia. I was not able to make a successful transplantation 
from the stock this year, and at the time of writing. all the green apices have 
disappeared. 
The points which seem to me from these observations worth record are (1) the 
narrowing of the prothallus and the assumption of the vertical habit in the feeble 
illumination, (2) the rigid maintenance of the morphological dorsiventrality in this 
condition, (3) the recovery of the capacity to produce archegonia on transplantation 
to more suitable conditions, (4) the great tenacity of life under unfavourable conditions, 
and (5) the comparative immunity from fungal attack. 
R. W. PHILLIPS. 
University College of North Wales, Bangor. 
September , 1918 . 
