57 



trides versicolor and pseudacorus came into flower this 

 spring in the beginning of June. 



The last appearance of migratory birds this year was 

 not noticed. - 



1807. 



Cuculus canorusj heard first .April 23. 

 lynx torquilla, April 30. 

 Hirundo rustica, first seen May 1. 

 Hirundo vrbica, the same day. 

 Hirundo apus, first seen, and numerous, May 16. 

 Flowers in bloom. Iris pseudacorus, June 14. P- 

 paver somrtiferum, the large white variety, July 2*. 



1808. 



Hirundo rustica, first seen April 18. From the 24th 

 to the 29th of the same month, no swallows were to be 

 seen; the weather being cold, with north wind, they 

 afterwards became numerous. 



Hirundo vrbica, seen first May 1 . 



lynx torquillaj the same day first heard. 



Hirnndo apus. This species first appeared, and was 

 abundant, May 14f. It was on the 21st of this month I 

 saw the lambent electric light about the leaves of plants 

 at eventide, described in my " Researches about Atmo- 

 spheric Phaenomena," note to chap. iii. 3. The fol- 

 lowing was the order in which the plants flowered this 



* It seems this plant will degenerate if the seeds be sown among 

 the red and other varieties. 



f The old tower of Hackney church used to abound with swifts; 

 which afforded me an opportunity, for many years, to notice their 

 first appearance. Of late years they have been less numerous there. 



