latest appearances of the swallows during a few years, 

 I shall conclude by advising a mode of furthering the 

 inquiry into the winter retreat of swallows in particular, 

 as well as of birds in general. A regular table should 

 be made out annually, from accurate observation, and it 

 should consist of seven or eight columns, as follows : thus, 



6 7 



The direction of the wind should always be particu- 

 larly noticed at the time of the swallow's arrival. The 

 wind is often wrongly registered in journals of the 

 weather, owing to the indicatorial letter under the 

 weathercocks being put up according to the compass 

 instead of the sun. I had some difficulty in getting the 

 meridian for fixing the letter of a large windvane which 

 I put up at Walthamstow the present spring, and I was 

 hence induced to inquire into the mode of fixing them in 

 general, which led to the knowledge of the above fact. 

 If the weathercock be put according to the compass, 



