LINNEAN SOCIETY OF LONDON. 287 
concentrated solution of chloral hydrate, and then mounted in 
glycerine. The nuclei resemble those of the ‘ knot-stage” of 
poe Bt divides stages being bee The observation is 
the 
true Algze oie now see m broken ese conclusions con- 
firm those of Zacharias gh ae published in the Bot. Zeit., but 
whose i shestions aPRee 9 to have been in a measure ‘anticipated 
hree places, if decimals be taken; if only two, there was 
Peovcally no difference between colour and darkness. Clear light 
alone gave a decided increase. Somewhat similar results occurred 
with etiolate sea- ee: except that wee as well as darkness gave 
a decided minimum, and clear light a mum. On testing the 
results of transpiration in = gr bids fees he found that 
box, privet, and willow-herb always transpired by day, but either 
not at all or else riches weight at night. On the other hand, 
saturated — wool and sponge continued to lose weight by day 
a m a sa nig oe Lastly, comparing trans- 
vidence is 8 given proving that peovoplannis movement is accele- 
in question is not due to increased tempera uth ro 
of Klodea and Vallisneria cells can be caused to rotate for several 
months by exposure to darkness, and this rotation does not differ. 
in any way from ordinary or positive rotation.—Mr. M. C. Potter 
read a paper “On Eypiclenmydia ope a new Alga growing on 
the back of a living Water Tortoise.” The cells of the plant 
whose ay surface is exposed to t ie water eee divide seg 
eg 8 perpendicular and parallel to the to ell 
= entering by cracks thereon, but deriving no pa from the 
