Biologie. — Varietäten, etc. — Physiologie. 
181 
Rhexia Mariana L. differs from the preceding species by pos- 
sessing no tuberous roots; however we find, also, in this species 
the vegetative propagation being confined to the development of 
rootshoots. The roots are very long and slender; they are horizontal, 
and several shoots may be t'ound on each of these, floral or vegeta¬ 
tive. The internal structure is the same as described above, bi.it the 
tissues are of course much less developed. 
The anatomy of stem and leaf is described, and among the 
characters that are common to both species may be mentioned : 
the bicollateral mestome-strands; the absence of subsidiary cells 
around the Stomata; the absence of collenchyma and stereome; the 
structure of the glandular hairs, and the bifacial leaf-structure. But 
they differ from each other by the stem being broadly four-winged 
with three mestome-strands in each wing in Rh. Virginica, while in 
the other species the wings are narrow and contain only a single 
mestome-bundle; moreover in Rh. Virginica the pith contained a 
central mestome-strand, which was not observed in the other species. 
Rhexia, thus, belongs to that type of plants in which the 
production of root-shoots is necessary to the normal development of 
the individual. It is a type rather poorly represented, but charac- 
teristic of certain species of: Cirsium , Linaria, Convolvulus, Thesium, 
Coronilla, Epilobium, and Euphorbia; Thladiantha dubia Bge. evidently 
belongs to this same category. Theo Holm. 
Doneaster, L., Inheritance and sex in Abraxas grossalariata. 
(Nature Vol. LXXVI. N°. 1967. p. 248. July 11, 1907.) 
Previous Statements with regard to the progeny of this moth, 
when crossed with its variety lacticolor are amply confirmed b}^ the 
result of experiments carried out during the past year. These Sta¬ 
tements are to the following effect: 
1. The type is completely dominant. 
2. DR 9 X DR (? gives DD g -4- DR DR ? + RR P. 
3. R ? X DR J gives DR ^ + R <?, DR ? + R % 
4. DR 2 X R cf gives DR R 
5. R $ X R gives R R §. R. H. Lock. 
Gregory, E. S., Pollen of hybrid violets. (Journal of Botany 
Vol. XLV. N°. 538. p. 377, 378. October 1907.) 
The author examined the pollen of the hybrids V. odorata X 
hirta, V. subcarnea X hirta and V. ericetorum X stagnalis and found 
it to be apparently good in each case. It is concluded that, although 
certain hybrid violets are infertile, the abortive development of the 
pollen cannot alwavs be regarded as a diagnostic character in discri- 
minating between the true species and the hybrid. R. H. Lock. 
Raeiborski, M., Beiträge zur botanischen Mikrochemie. 
(Bull. Acad. Sc. de Cracovie. p. 553—560. Juillet 1906.) 
Gelbe, frisch gemachte Lösung des Chinons benutzt der Verfas¬ 
ser als Reagenz auf Proteide, Peptone und aliphatische Amidosäuren. 
Die rothbraune Reaktion kann als Seitenstück zu der nur aroma¬ 
tische Gruppen der Proteide anzeigenden Millonschen oder zu der 
Xantoproteinsäurereaktion Beachtung verdienen. 
