1899 | CURRENT LITERATURE 367 
inthe District of Columbia, recognizing seven, three of them being described 
asnew, two having been recently described by Professor E. C. Greene, and 
the remaining two being the well-known species of Linnaeus.— WILLIAM 
PALMER (Proc. Biol. Soc. Wash. 13: 61-70. 1899) has published a list of the 
ferns of the Dismal Swamp, Virginia, sixteen in number, one of them being 
described as a new variety.— J. N. Rose (11th Ann. Rep. Mo. Bot. Gard. 1- 
j. 1899) has described a new species of Agave and critical notes on other 
species, accompanied by four plates.— E. P. BICKNELL in his further studies 
of Sisyrinchium (Bull. Torr. Bot. Club 26: 335-349, 445-457, 496-499. 1899) 
added eleven new species to the already long list of forms.— AVEN 
NELSON in continuing his publication of new plants from Wyoming (#did. 
350-358, 480-487) describes twenty-three new species, one of which repre- 
sents a new genus, WVacrea, related to Anaphalis —C. L. PoLLarD (zdid. 365- 
372) has revised the genus Achillea in North America, recognizing ten species, 
thtee of which are new.— K. M. WIEGAND (2ézd. 399-422) presents ten species 
of Bidens found in the United States and Canada, describing one new species 
ad five new varieties ANNA M. VAIL in continuing her studies of Ascle- 
Pladaceze (2béd. 423-431) discusses the types of Gonolobus and describes 
three new Species of Vincetoxicum.—P. A. RYDBERG (zbid. 541-546) has 
described twelve miscellaneous new species from the western United States. 
~A. A. HELLER in continuing the publication of his new and interesting 
ag from western North America (zbzd. 547-552) describes ten new species, 
_ Our of which are species of Mertensia.— J. M. C. 
SOME CURIOUS experiments by A, Pagnoul® on transpiration are reported 
the Experiment Station Record 11: 118. 1899. They are difficult to 
oa without more light than the brief summary gives ; but to call atten- 
in 
Pt first period, 33 days, the plants in the poor soil t 
_ ater per gram of dry weight; as compared with a transpiration of 5 5 ba 
Water In the second period the figures were 1053 and cae : 
F Stam of dry weight, and for the last period 1084 and 555°; 
h pot was deter- 
he product of the 
and it was found that for each gram of nitrogen int 
18™ of nitrogen 
of water was transpired, while in the rich soil 
€ach kilogram of water given off. 
ay l 
mh Sta. Agron, Pas de Calais 1898: 10-15. fg: J. 
