1905] CURRENT LITERATURE 239 
cells swell laterally and thus become barrel-shaped. Certain cells without nuclei 
increase in length but never swell in this way. Thus the author concludes that 
the swelling is brought about in some manner through the action of the ether upon 
e nuclear mechanism.—B. E. Livincston. 
Tscuircus° finds that many dicotyledonous plants possess two types of root 
in the same individual, one sort having a nutritive function and the other serving 
to fasten the plant to the substratum. The so-called “fastening roots” are dis- 
tinguished by the presence of mechanical fibers and generally by the absence of 
pith and by the larger size of the central cylinder—M. A. CHRYSLER. 
R. M. Harpers? has continued his valuable ecological and taxonomic obser- 
vations on the flora of Georgia, a state whose botany has been peculiarly unknown 
until these and previously noteds? studies were made. In addition to critical 
taxonomic notes, these papers contain accounts of the author’s itinerary, together 
with landscape figures and ecological remarks.—H. C. CowLeEs 
EPIPHEGUS VIRGINIANA has been studied by Cooke and ScHIVELY,53 who 
find that the parasitic haustoria arise from the roots of the host, the huni and 
not from the parasite. As is usual in such plants, there is a sperm 
and the embryo is rudimentary. Bicollateral bundles are found both in nthe 
tuber and in the aerial shoot—M. A. CHRYSLER. 
Wooprvrre-Pracocks4 has published some rather peculiar suggestions on 
the study of rock-soil floras. An immense number of habitat types are proposed, 
but no attempt is made at analysis. It is obvious that the author is not conversant 
with modern ss literature —H. C. CowLes 
£ TURE and sprouting of the seed, and the structure of the mature 
plant of Cisivahi filijormis are described by Miss Borwic.5s This plant, though 
a parasite resembling Cuscuta, has functional chlorophyll tissue, especially when 
growing in the shade.—M. A. CHRYSLER. 
TANSLEYS® gives an account of the methods which he has employed in eco- 
logical surveying with his classes on the coast of Brittany. The scheme makes 
Possible accurate and detailed mapping.—H. C. Cow Les. 
5° Tscuircu, A., Ueber die Heterorhizie bei Dikotylen. Flora 94:68-78. 1905. 
5t Harper, R. M., Botanical explorations in Georgia during the summer of rgor 
Bull. Torr. Bot. Club 30: nn pats 319-342. 1903. SSE HNC in the coastal hai 
of Georgia during the season of 1902. Bull. Torr. Bot. Club 31:9-27. 1904. 
5? See Bor. Gaz. 34: 386. 1902. 
OOKE, E., and Scuive ty, A. F., ti n the structure =i ae 
of Eephecu virginiana. Contrib. Bot. Lab. Univ. Penn. 2: 352-398. 
54 WooDRUFFE-PEACOCK, E. A., How to make notes for a ee hh Rural 
Studies Series, No. 5. Louth, 1904 
53 BoEwIc, Harriet, The histology and development of Cassytha_ filiformis. 
Contrib. Bot. Lab. Univ. Penn. 2: 399-416. 1904. 
8° TANSLEY. A, G., A second experiment in ecological surveying. New Phytol- 
ogist 3:200-204. 1904. 
