39 
number of halophytes (p. 24). They never transpire as 
much as the mesophytes. Any decided relation be¬ 
tween the intensity of transpiration and the salt accu¬ 
mulation does not exist. Consequently, the. xerophi- 
lous structure cannot always be interpreted as a mean 
for the exclusion of the salt. The salt content increa¬ 
ses, on the other hand, with the intensity of transpira¬ 
tion in one and the same plant (p. 13/14) 
d. The anatomy of halophytes was also touched 
upon. Sedum maximum and Solanum dulcamara have 
both sun and shadow forms. The shore forms are sun- 
forms. Both forms have about the same osmotic 
\ 
pressure. The turgor extension of the cells of the meso- 
phyll is, on the other hand, greater in the shore form 
enabling this latter one to produce a higher sucking 
power. 
Of two near related forms of Atriplex latifolium (Wg.) 
— the one pale yellowish green, living in the litoral zone, 
the other of a deep green colour, and living in the sup- 
ralitoral zone—the former has only half as many stomata 
as the latter, and contains only a third of the amount 
of chlorophyll per surface unit found in this. The tran¬ 
spiration is direct proportional to the number of sto¬ 
mates. The litoral form is also distinguished from the 
supralitoral form by a lower intensity of assimilation, 
Heribert-Nilsson, N., Experimentelle Studien über 
Variabilität, Spaltung, Artbildung und Evolution 
in der Glättung Salix, 145 s., 65 textf. (Lund. Univ. Arskr. 
N. E. Afd. 2, XIV: 2, n:r 28. 1918.) — Pris: 8 kr. 
Vi kunna icke här inlåta oss på att någorlunda full¬ 
ständigt referera denna stora och värdefulla afhandling, utan 
få vi nöja oss med några profbitar. 
Ett mycket stort antal hybridiseringar mellan rena arter, 
mellan hybrider och arter och mellan hybrider har det lyckats 
förf. att utföra och studera. Högsta antalet arter, han kunnat 
förena i en växt, var 6 -liksom vid Wichuras försök. Inalles 
fick han 653 buskar efter 49 hybridiseringar. 
