1058 EXPERIMENT STATION RECORD. 



the other a more general outgrowth of the lower part of the root. The (irst is of 

 rather general distribution, while the other occurs sporadically. These outgrowths 

 are due to several causes, nematodes among others, which interfere with the normal 

 development of the root. In such tissues the BUgar content is lowered very consid- 

 erably over the rest of the root. 



On a possible cause of the leaf spot or mosaic disease of tobacco, M. W. 

 Beijerinck (Centbl. BaU. u. J'ar., 3 Ait., ■', (1899), No. 1, pp. 37-33).— It is claimed 

 that the cause of this disease, and probably that of other plants which have hitherto 

 been unexplained, may be attributed to what the author terms a living fluid 

 contagium. 



Chlorosis in plants, G. Staes (Tijdschr. Plantenziekten, 4(1898), No. 4, pp. 97-115). — 

 The possible causes of chlorosis are discussed and means suggested for its preven- 

 tion. Applications of iron sulphate to chlorotic plants is recommended. 



Effects of lightning on the grapevine, L. Ravaz and A. Bonnet (Prog. Ayr. et 

 lit. (ed. Vest), 20 (1899), No. 13, pp. 392-399, pi. 1, fig. 1).— Notes the injury to many 

 vineyards in the vicinity of Montpellier and states that many so-called diseases may 

 be due to this cause, the injury preparing the way for numerous fungi and bacteria. 



Experiments for the prevention of potato scab, \ViLFAiiTH(L>ei//. Laiuhr. I'resxc, 

 35 (1898), No. 25, pp. 273, 274).— Experiments with " Sulfarin," a patented article 

 said to be composed of keiserit with 15 per cent of free sulphuric acid, are reported. 

 The powder was applied to the tubers and was efficient in reducing the proportion 

 of scabby tubers, but the yield was also diminished. 



On the treatment of seed potatoes with Bordeaux mixture and formalin, 

 G. STAES (Tijdsclir. Plantenziekten, 4 (1S9S), Xo. 3, pp. 65-71). 



ENTOMOLOGY. 



Proceedings of the tenth annual meeting of the Association of 

 Economic Entomologists ( V. 8. Dept. Agr., Division of Entomology 

 Bui. 17, n. ser.,pp. 101, figs. J). — At this meeting, held in Boston, Mas- 

 sachusetts, August 19 and 20, 1898, the following papers were read: 



The duty of economic entomology, H. Osborn (pp. G-12). — This is the 

 president's address to the Association. The matter is summed up under 

 three heads: (1) Acquisition of knowledge of life and habits and direct 

 remedies; (2) a knowledge of distribution and methods of prevention 

 or control; and (3) education of people to appreciation of this need 

 and to intelligent methods of application. 



Two beneficial insects introduced from Europe, L. 0. Howard (pp. 13-10, 

 figs. 2). — This gives an account of the importation by the author of 

 Scutellisia cyanea, a Chalcidid parasite of Ceroplastes. The parasite 

 was imported from Italy and has probably been successfully established 

 at Baton Rouge, Louisiana. 



The author also relates the accidental importation' near Boston of 

 another Chalcidid parasite, Habrolepis dahnanni, which attacks the 

 imported scale, Asterodiaspis querdcola. The scale seems to be thor- 

 oughly established about Boston and the parasite is also present in 

 large numbers. 



Notes on some of the insects of the year in the State of Net c York, E. P. 

 Felt (pp. 16-23). — This paper gives many biological and economic 

 details concerning a number of the more common injurious insects. 



