234 



Paillot (A.). Mecanisme de I'lmmunite humorale chez les Insectes. 



— C. 7^. /ichdoni. Accicl. Sci., Paris, clxxii, no. 7. 14th la'bnuuy 

 1921. i^p. :-597 399. 



As a result of further investigations on the immunisation of the 

 blood of Eiixoa ( Agrotis) segetiiHt against B. melolonthac non-lique- 

 faciens y, it is thought that granular transformation and bacteriolysis 

 may occur irrespective of any cellular activity or even the action of 

 a special antibody. These two phenomena appear to be the last 

 phases of a series of colloidal reactions between the organisms or 

 their products and certain constituents of the blood. Attention 

 is drawn to the striking analogy between the two reactions, viz.,. 

 bacteriolysis and the phenomenon of dispersion. 



Paillot (A.). Contribution a PEtude de PImmunite humorale chez 

 les Insectes. — C. K. licbdom. Acad. Sci., Paris, clxxii, no. 9, 

 28th February 1921, pp. 546 548. 



Subsequent experiments are said to have confirmed the hypothesis- 

 propounded in the preceding paper. 



Glillemet (P.). Rational Methods against Locusts in Morocco. — 



La Colonisation Fran^aise an Maroc, Casabhaica, i, 1920, pp. 4-6. 

 (Abstract in L'Agric. Colon., Florence, xv, no. 2, Februar\' 1921,. 

 p. 116.) 



The anti-locust methods employed in Morocco are vexatious to the 

 population and insufficient. A new organisation must be created and 

 placed rmder a specialist. The ]:)olicy of employing forced labour 

 must be abandoned. Premiums must be offered for information 

 relating to oviposition and hatching. The apparatus used must be 

 improved ; the flame-throwers developed during the war are much 

 superior to those used up to now in Morocco. An efficient anti-locust 

 ser\'ice will be expensive, but worth the mone}\ 



OuANjER (H. M.). De " Degeneratieziekten " van de Aardappelplant. 



[The "Degeneracy Diseases" of the Potato Plant.] — Vakblad 

 voor Biologen, H elder, ii, nos. 7 & 8, March- April 1921, pp. 

 97-104 & 117-121. 



Of the five or six existing forms of these diseases, two, leaf-curl 

 disease and mosaic disease, have been studied sufficiently to permit of 

 some information being given here. The experimental work with 

 plant-bugs and other insects has not yet yielded definite results. In this 

 connection no important results have attended attempts to obtain 

 sap, such as Myzoides persicae and other Aphids feed on, from diseased 

 plants, and to transmit the infection by this means. In the case of 

 the mosaic disease of tobacco, which resembles that of the potato, 

 infection by means of sap is easih* accomplished. 



Dlraxd (A.). Traitements preventifs contre PEudemis et la CochyHs. 



[Preventive Measures against Polvc/irosis botraiia and Clysia 

 amhiguella.] — La \'ie Agric. c^- Riir., Paris, x\iii, no. 11, 

 12th^March 1921, pp. 171-173, 2 tigs. 



The increasing importance of Polychrosis botrana in the \ineyards 

 of Southern France, where formerly Clysia arnbiguella was the chief 



