The microscopical journal Advertiser. 



An Introduction to the study of the Dintomaceas. By Fred'k Wm. 

 Mills. London and \Vashin<rton : 8°, 250 pp., Price $3.50. 



Profiting by bis experience, tbe autbor bas sougbt to make 

 unnecessary mucb labor on tbe part of tbe student, lor be bas 

 compiled wbat one requires into small space, as will be seen 

 from tbe following : 



TABLE OF CONTENTS. 



I. — Prelmiitiary. — "What are Diatoms ? — Habitats of the Diatomaceae. 

 Their extraordinary abuudance. — Diatoms form food for aquatic au- 

 imals in the arctic regions. — Found in the digestive organs of fishes. 

 Diatoms in guano. — Fossil Diatoms. — Longevity of Diatoms. Pages i — 3. 



II. — The Structure Of Diatoms. — Gelatinous envelope. — External 

 coating of silica. — Valves. — Diatoms' marking. — Raphe and nodules. — 

 Endochrome.— Nucleus. — Chemical properties of the endochrome ex- 

 amined spectro-scopically. — Oil globules in Pleurosignia. — Molecular 

 movement in the protoplasm. Pages 4 6. 



III. — The Movement oj Diatoms. — Movements observed. — The exist- 

 ence of eudosniatic and exosmatic currents. — The existence of cilia on 

 some parts of the frustule. — The existence of a snail-like foot external 

 to the frustule. — Movements caused by a modification of the interchange 

 of gases. Pages 7-15. 



IV. — Classification of the Diatomacece. — The raphidiese. — The pseudo- 

 raphidiese.— The Crypto-raphidieae. — Species. Pages 16-38. 



V. — j\fodes of Reproduction.— By simple division. — By auxospores. — 

 By conjugation. Pages 39-42. 



VI. — Collecting Diatoms. — How their presence may be detected. — 

 Free species. — Stipate specie.s. — Frondose species. Methods of collect- 

 ing. — Disintegrating fossil diatoms. Pages 43-45- 



VII. — Motmting Diatoms. — To mount m .?///^. — Method of preparing 

 frustules for mounting dry, or in a medium. — Mounting dry. — Mount- 

 ing in media. — Methods of charging the markings of Diatoms. — Mer- 

 curous sulphide method. — Silver nitrate method. — Color of final cell - 

 ringing. Pages 46-51. 



VIII. — Microscopical Examination of Diatoms . — Microscope stands. 

 — Objectives and Condensers. — The useof a Condenser. — Preparing en- 

 dochrome for examination by a micro-spectroscope. — Cutting sections 

 of valves. Pages 53-59. 



IX. — How to Photograph Diatoms. — The Camera. — The microscope 

 stand. — Objectives, and oculars. — The dark room. — Chemicals. — The 

 illuminant — Oxy-hydrogen. — Coal gas. — Paraffin. --Sunlight.— Mono- 

 chromatic light. — Exposure of the plate. — Development. — Printing. — 

 Lantern slide making, Pages 61-77. 



X. — Bibliography Relating to Diatomology.— Containing almost every 

 reference to Diatoms up to the present time, arranged alphabetically 

 under the authors' names. — Pages 78-240. XI. — Index.— Pages 241-3. 



