BIBLIOGRAPHY OF THIS VOLUME. 
First Instalment : Three Sheets and one Map (pp. 1-48) forming- 
Part II of the Transactions of the Yorksliire IVatnraHsts' Union, issued 
November, 1888. 
Second Instalment : Six Sheets and two Maps (pp. 49-144) forming 
Part 12 of the Transactions of the Yorkshire NaturaHsts* Union, issued 
January, 1889. 
Third Instahnent : Eight Sheets (pp. 145-272) forming Part 13 of the 
Transactions of the Yorkshire Naturalists' Union, issued September, 1889. 
Fourth Instalment : Four Sheets (pp. 273-336) forming Part 15 of the 
Transactions of the Yorkshire Naturalists' Union, issued Nov-ember, 1890. 
Fifth Instalment : Four Sheets (pp. 337-400) forming Part 17 of the 
Transactions of the Yorkshire Naturalists' Union, issued October, 1892. 
Sixth Instalment : Eighteen Sheets, with Indices, Titles, &c. (401-671), 
forming Part 33 of the Transactions of the Yorkshire Naturalists' 
Union, issued Februar}-, 1906. 
