| Purple Finches flock to the wahoo elm trees to feed on the buds, and Crossbills attack the pine cones. |
| The three types of cones are often, and somewhat misleadingly, equated with Maxwell's additive primaries of red, blue, and green. |
| They scrounged for pine cones for the fires, and both became adept at chopping kindling. |
| The second type of machine overcomes both of these disadvantages by making use of only one electric motor to drive a series of stepped cones. |
| However, this concept is challenged by the discovery of different pollen cones from the Arkansas and English Wealden localities. |
| The easiest way to describe light rays and light cones is through geometric optics. |
