Dates of publication of tlie several parts contained in this volume 
Part 1. Pages 1-32 . May, 1886. 
„ 2. „ 33-64 . .. July, 1886. 
,, 3. ,, 65-96 . October, 1886. 
,, 4. ,, 97-128 . January, 1887. 
„ 5. „ 129-160 . April, 1887. 
,, 6. „ 161-192 . August, 1887. 
,, 7. ,, 193-224 .. . November, 1887. 
,, 8. ,, ix-lii . April, 1888. 
,, 9. ,, i-viii, and 225-232 ...» . June, 1888. 
Dates of publication of previous volumes: 
Transactions of the 'Watford Natural History Society. 
Yol. I. (pp. lxiv and 248). August, 1878. 
,, II. (pp. lx and 260)... June, 1880. 
Transactions of the Hertfordshire Natural History Society. 
Yol. I. (pp. lxviii and 272) . May, 1882. 
,, II. (pp. lxviii and 286) . May, 1884. 
,, III. (pp. lxxii and 274) . March, 1886. 
