NOTES AND ABSTRACTS. 



789 



Nyssa uniflora ; Mangrove swamp with Bhizophora Mangle and Avicennia 

 nitida; and others. Full lists of the associated species are given, and 

 photographs of the scenic aspects. — G. S. B. 



Ecology: The Vegetation of the Bay of Fundy Salt and 

 diked Marshes : An Ecological Study. By W. F. Ganong (Bot. 

 Gaz. xxxvi. No. 6, p. 429). — This forms the conclusion of previous 

 papers, and deals with (B) the Mesophytic Division, Culture Section, and 

 (C) Hydrophytic Division. The former deals with reclaimed salt-marsh 

 formation and roadside formation ; the latter, with wet-marsh formation 

 and bog, the water-margin and swamp formation. 



In concluding the article, the author discusses " The Succession 

 of the Plants of the Marshland in Space and in Time." The 

 succession on newly reclaimed mud is first Salicomia type, next some 

 Sedge, but not abundantly. Spartina juncea follows with Triglochin, 

 Pucciuellia, and Hordeum. These are followed by Couch and Agrostis. 

 These are immigrants of the first year. As new ones come in the older die 

 out, till Timothy Grass appears, all others excepting Couch disappear- 

 ing. It is said by the farmers that the presence or absence of various 

 immigrants is dependent very much upon drainage. — A. H. 



Economic Plants of Porto Rico. By. 0. F. Cook and G. N. 

 Collins (U.S.A. Cont rib. from Natl. Herb. vol. viii. pt. 2, 1903, pp. 269 ; 

 plates 60). — Contains lists with descriptive notes of the economic plants 

 of the district with their common American and native names, and 

 illustrations of the chief. A valuable handbook for settlers and travellers 

 in the region. — F. J. C. 



Eelworm, Root-knot (Heterodera radicicola). — By Cecil Warburton 

 (Jour. B.A.S. vol. 63, 1903, p. 299; figs. 1, 2).— The author states that 

 several applications for advice with regard to the attacks by this pest have, 

 with a single exception, been in connection with either the Tomato or 

 Cucumber roots.* In October 1902, however, he received from Kent 

 specimens of Swede plants undoubtedly suffering from root-knot disease ; 

 a fact of very great importance to the farmer, as it proves that our 

 climate is no barrier to the spread of this destructive pest in the open air. 

 As a remedy for plants under cultivation on a comparatively small scale, 

 he recommends the use of carbolic acid at the rate of 33 oz. to 15 cubic 

 feet ; and as a means of prevention, he strongly disapproves the use of 

 composts containing the refuse of diseased crops. — B. N. 



Eel worms in Plants. By Ritzema Bos (Zeit. f. Pflanz. xiii. pp- 

 193-198, 1903 ; 2 figs.). — The author has already traced many cases of 

 disease in plants to the action of eelworms. New examples are here 

 described which show that Field Peas, Flax, and Anemone japonic a must 

 be added to the list of possible host-plants of Tylenchus devastatrix. 



W. G. S. 



Egyptian Agriculture, Notes on. By G. P. Foaden (U.S.A. Dep. 

 Agr. Bur. PI. Ind. Bull., 62; 7/1904). — Some valuable information is 



* The pseudo-bulbs of the Calanthe have been known to be attacked by this disease 

 in this country with disastrous results. — B. N. 



