332 BOTANICAL GAZETTE [MAY 
growth) after the culture had continued for a month. The results 
appended are only approximate. 
PER CENT. OF SEA WATER TOLERATED WITHOUT SPEEDY INJURY. 
BOC i a eR BG 
eerea Ps oN a Oe ke oe 
chinopnore Ses. a Se OOF More 
Polygonum maritimum . ode 50 
Bapnorbriterraciia . . 5. 4 sw tl ee Ce” GO Orless 
For the sake of comparison a few cultures were made of species 
growing in full sunlight in the vineyard the soil of which was analyzed 
for chlorin as above given. All soon succumbed to the effect of 50 
per cent. sea water (and in general still more readily to 1.5 per cent. 
sodium chloride solution). Classed according to the readiness with 
which they wilted and then died, their sensitiveness to the salts in 
solution was about in the following order.: 
1. Lamium amplexicaule. 6. Geranium molle. 
2. Fumaria Gussonii. 7. Rumex bucephalophorus. 
3. Papaver Rhoeas 8. Euphorbia Peplus. 
4. Polygonum aviculare aks ian g. Anthemis arvensis var. 
5. Veronica Tournefortii 
Roughly speaking, the order above given is that in which these 
annuals wither and die at the onset of the summer drought, except 
as regards no. 3, which persists well into the dry season. 
In order to compare the behavior of the plants of Association A 
with that of true halophytes, cultivated in saline solutions, some 
seedlings of Salsola Kali Tragus were procured from the sand adja- 
cent to Mare Morto, above described. The plants were 2-2.5°™ 
high and cultures were made of these in clean sand, rinsed with the 
saline solution to be used, and then flooded once a day with another 
portion of the solution, which was afterwards poured off. The con- 
_ centrations employed were respectively of 4, 5, 5.5, 6, and 7 per cent. 
of sodium chlorid, and other specimens were cultivated in solutions 
without sand. 
In sand the plants appeared normal up to and including 6 per 
cent. sodium chlorid solution, though growth was slow for all con- 
centrations above 4 per cent. Without sand prompt loss of turgor 
was noticed in 6 per cent. solution, corresponding pretty nearly to 
that observed in the solution of 7 per cent. with sand. This dimin- 
