BIBLIOGRAPHY. Ill 



account of the number, but also the scientific interest of the pre- 

 parations. A large number are authentic type forms, and are taken from 

 de Brebisson's gatherings. 



The preparations are alphabetically arranged in series, of 25 in 

 boxes bookwise. The complete collection consists of 28 boxes, contain- 

 ing in all 700 preparations. 



Smith (Rev. Wm.) The author of the Synopsis of British 

 Diatomacece, published 275 type preparations, illustrating his synopsis. 

 These preparations are excessively rare at the present time. We have 

 used some in making the drawings for our work. Mr. Smith has also 

 published a series of preparations made from the material collected 

 during his excursion in the Pyrenees. This collection is, we believe, still 

 rarer than the previous one, and we have not seen any other than that 

 in our possession. 



Tempere (J.) and Peragallo (H.) " Diatomees du monde entier." 

 A collection of 625 preparations, comprising the larger portion of known 

 fossil deposits, and a large number of marine, pelagic and fresh water 

 gatherings, etc. With an explanatory text giving an analysis of each 

 preparation. 



Van Heurck (Dr. Henri.) Types an Synopsis des Diatomees de 

 Belgique. Under this title, we have published a collection of Diatoms, 

 accompanied by notes and diagnoses by Mr. A. Grunow. The pre- 

 parations are enclosed in boxes of 25 bookwise, identical with those of 

 Mr. H. L. Smith. The preparations, 550 in number, are made in 

 Styrax (a medium which we made known in 1883), and which has the 

 double advantage of a high index of refraction and inalterability. These 

 preparations comprise nearly all the important forms described in the 

 Synopsis. Much of the material comes from the original gatherings of 

 Walker-Arnott, Gregory, Greville, Eulenstein, etc. 



3. Collections used for this Work. 



In writing this work we have consulted the following collections, 

 which now form part of our botanical museum : 



1. Adan, H. t author of the " Monde Invisible ." This collection 

 comprises about 2,000 slides, including a very considerable number of 

 rare and interesting diatoms. 



2. de Brebisson. A large number of gatherings. 



3. Cleve and AI oiler's Diatoms. Collection previously mentioned. 



4. Delogne. Collection previously mentioned, as well as the material 



