444 EXPEEIMENT STATION RECORD. [Vol. 43 



The differential staining of plant pathogen and host, B. T. Dickson 

 {Science, n. scr., 52 (1920), No. 1333, pp. 63, 64). — A description is given of a 

 method of staining by which a clear differentiation is brought out of tlie fungus 

 and its host plant. 



The " iceless refrigerator " as ah inoculation chamber, N. R. Hunt 

 (rhytopathology, 9 (1919), No. 5. pp. 211, 212, pi. Jf).— The author describes 

 the use of the iceless refrigerator as an inoculation chamber, and states that 

 various members of the Office of Forest Pathology, Bureau of Plant Industry, 

 U. S. Department of Agriculture, have successfully used this apparatus for 

 inoculations with various species of Coleosporium and Cronartium. 



The role of bacteria in plant diseases, E. M. Doidge {So. African Jour. 

 Set., 16 {1919). No. 2, pp. 65-92). — Besides a systematic treatment of the his- 

 torical development of opinion and knowledge regarding the bacterial causation 

 of plant diseases, this address deals separately with symbiosis, organisms 

 pathological to plants, agents of transmission, factors favoring infection, its 

 occurrence, latency period, and symptomatology, and pathological plant anatomy. 

 Important or typical plant diseases are discussed sepai-ately. A long list of 

 related literature is appended. 



Giant crown galls from .the Florida Everglades, B. T. Galloway {Phyto- 

 pathology, 9 {1919), No. 5, pp. 207, 208, pi. 1). — A description is given of un- 

 usually large galls or swellings on Ilippocratea volubilis and Ficus aurea. From 

 the galls the crown gall organism {Bacterium tumefaciens) has been success- 

 fully isolated. 



Puccinia subnitens and its aecial hosts, II, E. Bethel {Phytopathology, 

 9 {1919), No. 5, pp. 193-201). — In continuation of a previous publication 

 (E. S. R., 38, p. 249), in which the author reported on the hosts of this rust, 

 additional studies are given which indicate that P. subnitens is known to occur 

 on 84 host species, in 52 genera belonging to 19 families of plants. Attention 

 is called to the variability of the secia on different hosts and often on the same 

 plant. The extreme variability of many of the -Ecidiums which have been de- 

 scribed for P. subnitens is believed to indicate that there are several unattached 

 species vsMiich should be referred to this rust. 



Puccinia malvacearum and the mycoplasm-lheory, M. A. Bailey {Ann. 

 Bot. [London], 84 {1920), No. 134, PP- 173-200, figs. 2).— This work was started 

 in order to throw further light on the grounds for or against the various views 

 regarding the mycoplasm theory, as herein outlined with discussion in connec- 

 tion with the work of Eriksson and others. A critical discussion is given of 

 the conditions surrounding the hollyhock seeds and young seedlings as regards 

 the possibility of infection of the seeds by P. malvacearum. 



The chemical composition of Bordeaux mixture, A. Wober {Ztschr. 

 Pflansenkrank., 29 {1919), No. 3-4, pp. 94-104). — This deals with what is 

 known or thought regarding the acid, the neutral, and the alkaline phase of 

 Bordeaux mixture. The last named is regarded as the most durable and reli- 

 able as a fungicide for use on foliage. 



Mycology and plant pathology [India, 1918-19] {Rpt. Prog. Agr. India, 

 1918-19, pp. 63-70). — The progress of the year is briefly reviewed, including 

 work with rice ufra (Tylenchus angustus) and blast (Piricularia oryzoc) ; 

 jute black band {Diplodia corcJwri) and a sclerotial fungus, Rhizoctonia solani; 

 sugar cane smut {Ustilago sacchari), red rot, and two sclerotial diseases of 

 minor importance; chilli pepper die-back {Ver-micularia capsici), the blossom 

 and twig rot due to Choanephora cucurbitarum being absent this year, pre- 

 sumably on account of the dry season; pigeon pea wilt {Fusariurn udum) ; 

 diseases of Rangoon beans {Phaseolus lunatus), {Sclerotinia sp.?) ; tea stem 

 disease {Nectria cinnabarina), and black rot {Hypochnus sp.) ; coffee leaf 



