398 Transactions of the Boyal Society of South Africa. 
From 23/5 09 kept in the open, but im- 
mersed daily for 15 minutes in water. 
29/5/09 Weight, 5-071 gr. 
Further loss, '531 = 8-5 
original weight. 
Total loss, 18'3 per cent. 
per cent, of 
II. 
Kept dry in laboratory. 
16/5/09 Weight, 9-277 gr. 
23/5/09 Weight, 8-672 gr. 
Kept further in the laboratory, but im- 
mersed daily in water for 15 minutes, 
except on the last day when immersion 
lasted 5 hours. 
29/5/09 Weight, 9-011 gr. 
Loss, -605 gr. — 6 5 per cent. 
Gain, -339 gr.,* which still leaves a loss 
of 266 gr. =2-9 per cent, as com- 
pared with the original weight. 
Crassula cymosa, L. 
Four branches. 
I. 
Exposed in the open, but otherwise not 
interfered with. 
23/5/09 Weight, 5-62 gr. ~ 
29/5/09 Weight, 5-202 gr. Loss, -418 gr. = 7-5 per cent. 
II. 
Exposed in the open, but immersed every 
day in water for 15 minutes. 
23/5/09 Weight, 7-217. 
29/5/09 Weight, 6-71. Loss, -507 gr. - 7 per cent. 
III. 
Kept in laboratory, but not interfered with. 
23/5/09 Weight, 7-125 gr. 
29/5/09 Weight, 6-29 gr. Loss, "835 gr. = 11-6 per cent. 
IV. 
Kept in laboratory and immersed daily in 
water for 15 minutes, except on the 
last day when immersion lasted 5 
hours. 
23/5/09 Weight, 8-591 gr. 
29/5/09 Weight, 7-864 gr. Loss "727 gr. - 8-5 per cent. 
Exposure to dew and immersion did not prevent considerable loss, 
though immersion conferred a slight advantage on branches subjected 
to it. 
* This gain will be referred to again later on. 
