Nos. 455-456.] NOTES AND LITERATURE. 



Three new exotic orchids ascribed to Rolfe are described by Ames 

 in Proceedings of the Biological Society of Washington, of June 9. 



Two new Jamaican species of Polypodium are described by Maxon 

 in no. 1374 of Proceedings of the U. S. National Museum. 



Blakeslee has an interesting note on the sexuahty of Rhizopus in 

 Science of June 3. 



A paper on vitality and germination of seeds, by Duvel, forms 

 Bulletin no. ^8 of the Bureau of Plant Industry of the U. S. Depart- 

 ment of Agriculture. 



A re'sume' of ecological work in 1903 is given by Cowles in Science 

 of June loth. 



A healthy sane tone pervades an article by Holt on the value of 

 field and herbarium work in high school botany, published in School 

 Scie?ice for June. 



Ecological experiments on Rumex Acetosella are described by 



A critical study of Lepidium is being published by Schinz in the 

 Bulletin de V Her bier Boissier. 



A popular account of the native Papaw is given by Viola McCohn 

 in Cotmtry Life in America for July. 



A further list of Eastern species of Crataegus is published by 

 Ashe, under date of June 15, in vol. 20, no. 2, of the fournal of the 

 EUsha Mitchell Scientific Society. 



Professor Bessey calls attention, in Science of June 24, to the early 

 falling of the aberrant lowermost leaves of Acer Negundo each year. 



The July number of Arboriculture, printed on paper made from • 

 the wood of Catalpa, contains data as to the availability of this wood 

 for paper purposes. 



A review of Californian Polemoniaceae, by Jessie Milliken, forms 

 vol. 2, no. I, of the University of California Publications, Botany, 

 issued May 10. 



Heft 19 of Engler's " Pflanzenreich," is devoted to Betulaceae, by 

 Winkler. 



An account of Persea gratissima as cultivated in Florida is pub- 

 lished by Rolfs as Bulletin no. 61 of the Bureau of Plant Industry of 

 the U. S. Department of Agriculture. 



