CHAP. 4. 7. OP PROGNOSTICKS. 161 



has given a list of the times of the first appear- 

 ance of migratory birds for several years : and 

 I have given tables of their appearance in 

 Nicholson's Phil. Jour, and in my Observations 

 on the Brumal Retreat of the Swallow,* whereby 

 the reader, by comparing the birds' appearance 

 with the seasons, may obtain some information 

 on this point. 



The abundance of berries in the hedges is 

 said to presage a hard winter, but this often 

 fails. 



SECTION VII. 



Of Solar and Lunar Influence. 



THE influence of periods of day and night 

 on many diseases which have been incontro- 

 vertibly proved, and the recurrence of many 

 after certain intervals of time, show that there 

 is some truth in the notions of many physio, 

 logists about Periodicity; and that this is 

 probably effected by means of some unknown 



* Nat. Hist. Swallows, Underwin, London, 1817, 5 edit. 

 Appendix. 



M 



