ARTIFICIAL DISSEMINATION. 



93 



passed on to the railroads for other uses, frequently without being 

 swept out at the mills. It is common in the lumber country for cars 

 to pass from oil mills to lumber mills. Such cars are often found 

 containing several pounds of seed in the corners. The lumber men 

 sweep out this waste before loading their cars. In case cotton grows 

 near the mill the danger is quite apparent. 



An interesting example of the shipment of the weevil in cotton- 

 seed came to notice in Mexico a few years ago. 1 On January 5, 1903, 

 it was discovered that Texas-grown cottonseed was being imported 

 into the southeastern part of the Laguna district in Mexico. 2 Exami- 

 nation of this seed, made by Prof , L. de la Barreda, revealed the fact 

 that six lots had been received from infested points in Texas and 

 that each of these lots was at that time infested with live boll weevils. 

 The results of an examination of samples from three consignments 

 are given in Table XXXII. 



Table XXXII. — Result of examination of infested cottonseed shipped to Mexico. 



Number 

 of sacks of 



seed 

 examined. 



Boll 



weevils 

 found. 



Alive. 



Dead. 



8 

 4 

 2 



27 

 11 



57 



2 

 2 

 10 



25 

 9 

 47 



14 



95 



14 



81 



The results of these careful examinations show very clearly the 

 possibility of transporting live weevils in shipments of cottonseed. 



Unless the oil mill is within the infested territory and ships hulls to 

 points outside there can be very little danger from this product. In 

 fact, it is hardly possible that weevils are ever spread by means of 

 cottonseed hulls. 



BALED COTTON. 



One of the writers has found live weevils in bagging about bales 

 consigned to Liverpool on the wharves at New Orleans. However, 

 as has been pointed out, experience has shown that the danger from 

 this source is very slight. 



PASSING VEHICLES. 



Carriages, wagons, and railroad trains, in passing fields where the 

 weevils are numerous, may carry them great distances, although few 

 specific observations have been made on this matter. 



MOVEMENT OF FARM HANDS. 



Many laborers frequently pass from infested territory to uninfested 

 territory. Their practice is to use cottonseed for packing breakable 

 household articles. If the movement takes place late in the season 



i The remainder of this and the next paragraph are from Bull. 51, p. 125. 

 2 Boletin de la Comision de la Parasitologia Agricola, vol. 2, pt. 2, pp. 45-58. 



