218 BOTANICAL GAZETTE [MARCH 
aluminium, through which the emanations pass more readily. In all the trials he 
finds that although the germination is not prevented there is a period of retarded 
growth in the seedling. The elongation of the root or stem may be temporary or 
rmanent according to the duration of the exposure. In the latter case the 
injured organ persists indefinitely without disorganization, but further growth of 
the seedling occurs in the form of secondary members. In the case of Vicia Faba 
such a condition will follow an exposure of only one hour; yet an exposure of four- 
teen days does not prevent germination. Since the retardation of growth occurs 
sooner in the root than in the stem of a given seedling, the author favors the expla- 
nation offered by other investigators, who have worked on entirely different mate- 
rial, that organs engaged in photosynthesis are more resistant to the emanations. 
The author’s experiments offer no conclusive evidence on this point. Organs of 
seedlings from seeds exposed to emanations retain geotropic sensibility as long as 
they are capable of growth, the two capacities being concurrent. The same is true 
of heliotropic sensibility. His earlier view that radium emits enough luminosity 
to induce heliotropism, which was questioned by Mo tiscu, is maintained. Im- 
portant as these results are, it seems to the reviewer that their value would be much 
greater if obtained under standardized conditions—RAyMoND H. Ponp. 
Anatomy of Matonia.—TansLry and Luria describe the development and 
mature anatomical structure of a number of specimens of Matonia pectinata 
gathered by one of them on Mount Ophir in the Malay Peninsula.": The coty- 
ledons in this species are bilobed as in the polypodiaceous ferns. Below the first 
leaf the central cylinder of the young stem consists of a rod of xylem, surrounded 
by parenchyma alone; later phloem appears on the outside of the stele and in 
the center as well. Subsequently the endodermis and “oround tissue”’ likewise 
appear within the stele, which becomes typically siphonostelic. By a process of 
“local dilatation of the m rgin of the leaf gaps” an internal mass of fibrovascular 
tissue appears, which ultimately becomes tubular and lies within the original 
fibrovascular tube. This inner tubular fibrovascular bundle subsequently gives 
off an internal tracheary strand, which may also become tubular, so that there 
may be in Matonia as many as three tubular bundles lying one within the other. 
These join each other only in the region of the nodes. The authors consider the 
internal fibrovascular system asa storage tissue only, since it has no direct con- 
nection with the roots, which are attached to the external cylinder, as in other 
ferns of this type. The views as to the morphological nature of the complex 
fibrovascular system of the stem in this species may be regarded as “ orthodox,” 
since the conclusion is reached that it constitutes a single stele. The hypothesis 
that the pith is intruded cortex is accordingly rejected, since the authors are of 
the opinion that the only trustworthy criterion as to the morphological value of 
tissues is to be derived from a study of their relation to the aera meristems 
of the growing point.—E. C. JEFFREY. 
_TANSLEY, A. G., and LuLHaAM, Miss R. B. J., Astudy of the vascular system 
of Matonia pectinata. Annals of Botany 19:476-519. pls. 31-33. 1905- 
