390 ANNUAL RECORD OF SCIENCE AND INDUSTRY. 



is the result of immigration from the South, and that it dies 

 out every year with its food-plant, the eggs which it lays 

 not coming to maturity, being killed by the inclemency of 

 the weather. He finds testimony that, for many years after 

 the introduction of the cotton-plant into the Southern States, 

 the cotton-worm did not appear, and that its existence in 

 Southern Alabama but little preceded the late war. It is, 

 however, capable of extended flights, as it has been observed 

 in the Eastern States and also at Buffalo and Chicago. The 

 supply of the insect is therefore maintained every year by 

 means of flights from the South, which are somewhat capri- 

 cious, and may be diverted out of their course by powerful 

 currents of wind occurring at the time of their migration. 



The inference drawn from these facts by Mr. Grote is that 

 the process of artificial extermination may be simplified by 

 limiting the period during which it can be successfully at- 

 tacked, and by doing away with a certain class of proposed 

 remedies. The agent employed to destroy the worm must 

 be used against the first brood, as it appears in any given 

 locality during its progress northward, and that, to be ef- 

 fectual, the action must be concerted in the application of 

 the remedial agent. 



Mr. Grote strongly recommends the introduction of the 

 English sparrow, and additional legal protection to insectiv- 

 orous birds, as absolutely necessary to the agricultural in- 

 terest. 5 Z>, Dec, 1874, 726. 



HORSE-POX. 



M. Depaul describes what he calls horse-pox in horses, the 

 symptoms manifesting themselves in fever, prostration, a cer- 

 tain elevation of temperature, cough, engorgement of the sub- 

 maxillary ganglions, and in having in the nostrils of the left 

 side a series of circular projecting pustules, depressed in their 

 centre and exhibiting characters similar to those of variole. 

 These pustules form a distinct eruption on all parts of the 

 body. 



The experiment has been made of inoculating a child and 

 a heifer with this substance; but the result has not yet been 

 announced. 



M. Bouley, the eminent veterinary surgeon of Paris, re- 

 marked, in the presentation of this communication to the 



