II 



■ Deep view. 



!" Nearer view. 



" There is something wrong here. J. J. L. dated this slide May 23, 1895, 

 11: 50 a. m. but it obviously belongs here as a second chamber is in process of 

 formation. I think it should have been dated May 24. After E. 18 (which is 

 not reproduced) the slides are not numbered, but his register of photographs 

 gives the numbers 19 cf scq. 



The last of these, figure 20, is one of the two slides in the collection, 

 showing different magnifications of the same object, which are regis- 

 tered as Ser. F. i & 2 but no dates or times are given. They are from 

 another specimen and represent the post-final stage (probably 25-26 

 May) when a second chamber has been added. They are registered 

 in the Heron-Allen and Earland Lantern-slide Collection as 12/46-47. 



In conclusion I may be allowed to pay a tribute of warm gratitude 

 to Mrs. Lister, whose early death occurred shortly afterwards, for 

 the public spirit which led her to present the Lister Collections in 

 general, and these priceless note-books, preparations (there are nearly 

 450 of P. crispa alone in our collection at South Kensington), and 

 lantern slides, to the nation for the use of future generations of 

 students. I desire, also, to express my gratitude to Dr. J- A. Cushman 

 for correcting the proofs of this paper. 



