i8o 



SCIENCE. 



[Vol. XVIII. No. 451 



cessfully in capturing the insects ; that the simplest form, a flat 

 piece of sheet-iron, was most satisfactory; that one application 

 resulted in adding thirty-four per cent to the crop of hay on a plat 

 experimented on, and at one experiment leaf-hoppers were cap- 

 tured at the rate of 376,000 per acre. Kerosene emulsion for plant 

 lice was used once with poor success, but later an application of a 

 good emulsion by thorough methods resulted in complete success. 

 • Grasshoppers are mentioned as troublesome this season, and re- 

 ports of Rocky Mountain grasshoppers are referred to. No present 

 damage to Iowa is apprehended from this latter species, and 

 methods of controlling the common native species, when numer- 

 ous, are discussed. The flavescent clover weevil is found abundant 

 at Ames. Its distribution is referred to and its method of work 

 described. Information regarding its occurrence in other parts of 

 the State is requested. The wheat-bulb worm has occurred in 

 ; moderate numbers, but abundant parasites have been found to 

 attack it at Ames, and its serious multiplication is not consider'ed 

 probable. 



— M. E. Heokel of Marseilles has recently described an interest- 

 ing case of mimicry which may be frequently seen in the south of 

 France. The mimic, Nature states, is a spider, Tliomisus onustus, 

 which is often found in the flowers of Convolvulus arvensis, where 

 it hides itself for the purpose of snaring two Diptera, Nomioides 

 minutissimus and Melithreptus origani, on which it feeds. Con- 

 volvutus is abundant, and three principal color variations are met 

 with: there is a white form, a pink one with deep pink spots, and 



a light pink form with a slight greenishness on the external wall 

 of the corolla. Each of these forms is particularly visited by one 

 of three varieties of Thomisiis. The variety which visits the 

 greenish form ias a green hue, and keeps on the greener part of 

 the corolla; that which lives in the white form is white, with a 

 faint blue cross on the abdomen, and some blue at the end of the 

 legs; the variety which lives in the pink form is pink itself on 

 the prominent parts of the abdomen and legs. If the animal hap- 

 pens to live on Dahlia versicolor the pink turns to red, and if it 

 lives in a yellow flower — Antirrhinum niajus, for instance — it 

 becomes yellow. At first Professor Heokel supposed the three 

 varieties of Tliomisus to be perrnanent, but he discovered acci- 

 dentally that any one of these peculiarly colored spiders, when 

 transferred to a differently colored flower, assumes the hue of the 

 latter in the course of a few days; and when the pink, white, green, 

 and yellow varieties are confined together in a box, they all be- 

 come nearly white. 



— During the nesting season the male ostrich seems to be any- 

 thing but an agreeable creature. In a paper lately read before the 

 Royal Society of Tasmania {Nature, Sept. 10), Mr. James Andrew 

 says that at that pei-iod the biid is most pugnacious, and may only 

 be approached in safety with great precaution. He resents the 

 intrusion of any visitors on his domain, and proves a most for- 

 midable opponent. His mode of attack is by a series of kicks. 

 The leg is thrown forwards and outwards, until the foot, armed 

 with a most formidable uaU, is high in the air ; it is then brought 



Publications : 



eceived at Editor'! 

 Sept. 16-22. 



Bailey, L. H. Annals of Horticulture in North 

 America for the Tear 1890. New YorK, Rural 

 Publ. Co. .313 p. 8°. §1. 



Davis, G. G. Anales de la Oficina Meteorolop;ica 

 Argentina. Tomo VIII. Climas de Chacra de 

 Matanzas, Corrientes, Catamarca, Mailin, y 

 Cochinoca. Buenos Ayres, Coni 6 Hijos. 569 p. 

 f°. 



Davis, J. Woodbridge. Theoretical Astronomy: 

 Dynamics of the Sun. (Woodbridge School Es- 

 says, No. 1.) New York, Woodbridge School. 

 97 p. 4°. 



Bmtage, W. T. a. An Introduction to the Mathe- 

 matical Theory of Electricity and Magnetism. 

 (Clarendon Press Series.) New York, Macmil- 

 lan. 228 p. 12». $1.90. 



Occultism, the Key of Nature. Vol.1. No. 1. Bos- 

 ton. 16 p, 4°. 



RiCHTER, V. von. Chemistry of the Carbon Com- 

 pounds; or. Organic Chemistry. 2d ed. Phila- 

 delphia, Blakiston. 1040 p. 8°. 83.50. 

 -Weismann, a. Essays upon Heredity and Kindred 

 Problems. Vol. I. 2d ed. New York, Macmil- 

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