2 LABORATORY MANUAL OF AGRICULTURE 



Some seeds produced in pods are thrown out with consider- 

 able violence when the pods burst open. The common pea 

 and locust are examples of this method of distribution. 



Many seeds, known as burrs, bear small hooks or spines 

 which adhere to the hair of animals and to the clothing of 

 man. Such seeds are sometimes carried long distances 

 before they are removed. The sand burr and cockle burr 

 afford good illustrations of this method of distribution. 



Directions. Make a journey into the fields, visiting, if 

 possible, a cultivated field, a pasture, a hillside, a wood lot, a 

 creek bank, and a roadside. Collect as many kinds of seeds 

 as can be found growing in these places. Make a list of 

 the names of the seeds that have been gathered. Record 

 in the accompanying outline form the Hame, the locality 

 where collected, and the means that the plant uses for dis- 

 tributing its seeds. 



