394 ANNUAL RECORD OF SCIENCE AND INDUSTRY. 



administered in a weak infusion. Seed of the plant known 

 scientifically as the Pyrethrum roseum, and which is obtain- 

 able from large seed-dealers, is to be sown in May, not too 

 thickly, in a well-cultivated bed ; which will develop large 

 stalks by fall, if the weeds are kept down, although it seldom 

 blooms before the next May or June. The flowers are to be 

 plucked as they become fully developed, and the yellow disk- 

 flowers separated from the red rays and calyx, thoroughly 

 dried in the shade, and finely pulverized. Flowers can be 

 plucked even in the autumn, so that a few beds will produce 

 a considerable quantity of the powder, and as the plant is 

 perennial, it can be propagated by dividing the old stalks in 

 the fall. Since it is indigenous to the Caucasus, it is not 

 very sensitive to winter temperature. 8 C, August 14, 1873, 

 273. 



NEW FORM OF BLIGHT OX FOREST TREES. 



A new form of blight is reported as attacking beech-trees 

 in Westphalia. A snow-white, downy substance appears 

 upon the bark and gradually covers the tree, sometimes pro- 

 ducing death. It is shown by the microscope to consist of 

 fine threads, among which appear great numbers of small in- 

 sects by which these are secreted. It has the properties of 

 wax, having nearly the composition and melting-point of 

 Chinese wax. It is, in part, saponified by potash, the soap 

 yielding an acid, with a melting-point of 51.5. The unsa- 

 ponified portion melted at 140-145, and seemed to be rich 

 in carbon. Landwirth. Versuch- Stationen , 1873, XVI, 198. 



EXTERMINATION OF TREE-BEETLES, ETC. 



An old, headless barrel, smeared internally with tar, hav- 

 ing a properly protected lamp in the bottom, will collect 

 large quantities of beetles during a night. 9 C,Jidy, 1813, 



108. 



DESTROYING MAY-BUGS. 



A French writer gives the following method of destrovinsr 

 the May-bug, or cockchafer, on a large scale, his captures 

 amounting to ten or fifteen gallons in a night. For this pur- 

 pose he smears with tar the inner surface of an old barrel, 

 one head of which has been removed, and at twilight he 



