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BIBLIOGRAPHY OF THIS VOLUME. 



First Instalment : Sheets A, B, C, pages 5-52, roiming Part 22 of the 

 Transactions of the Yorkshire Natwralisls' Union, ptililished September, 

 1900. 



Second Instahiient : Sheets D, E, F, pages 53-100, forming Part 23, 

 published December, 1900. 



Third Instahiient: Sheets C'r, II, I, J, pages 101-164, forming Part 

 25, pulilished Jidy, 1901. 



Fourth Instahuent : Sheets K,.L, M, N, O, P, pages 165--239, includ- 

 ing Title-Page and Index, forming Part 27, published July, 1901. 



