It seems likely that the fact of not considering one or other of these points may account for the difference in regard to some of the views held by observers of experience. For instance, may it not account for the fact that there is such a marked difference of opinion as to whether the peregrine is faster than the golden plover? May it not be true that for a short distance the latter bird may be the faster flier, but that in consequence of its lack of staying power it is overtaken before it goes half a mile unless it can elude its pursuer by twists and turns. In this connection it is worth recalling the experiences of that acute and accurate observer Charles St. John[9]: “The golden plover,” he writes, “is a favourite prey, and affords the hawk a severe chace before he is caught. I have seen a pursuit of this kind last for nearly ten minutes--the plover turning and doubling like a hare before greyhounds, at one moment darting like an arrow into the air, high above the falcon’s head; at the next sweeping round some bush or headland--but in vain. The hawk with steady relentless flight, without seeming to hurry himself, never gives up the chace till the poor plover, seemingly quite exhausted, slackens her pace, and is caught by the hawk’s talons in mid-air and carried off to a convenient hillock or stone to be quietly devoured.” Colonel Meinertzhagen has been so kind as to consider the observations I have made above, and writes: “I should doubt whether the golden plover has less staying power than the peregrine. The former migrates long distances (thousands of miles, in the case of the American golden plover, a bird almost identical with ours, which goes from Labrador to Brazil by sea), whereas the peregrine is nowhere believed to be a regular or persistent migrant over long distances. It is more probable that the peregrine is a faster bird than the golden plover and that the latter becomes exhausted by continued acceleration and fear, whereas the peregrine is accustomed to long periods of accelerated flight and is stimulated by hunger.” Again in reference to the difference of opinion as to whether the teal is faster than the mallard, may it not be possible that both views may be correct? in other words, that it depends upon the length of flight which the writer is considering. It may be noticed that Major Radclyffe in the passage which I have quoted above (p. 28) seems to consider it may be possible that for a short distance the teal may be faster than the mallard, though he has no doubt that the latter bird will very soon overtake the former. The falconer has certainly more and better opportunities of seeing birds flying at their maximum rate of speed than any one else. “He also has,” to use Captain Portal’s words, “the advantage of possessing in his trained hawk a known quantity with which to compare the performances of other birds.”