CONTENTS. ^AGE 



Presidential Address: "What is a Spider? ... ... 1 



On the Nature of Supernumerary Appendages in Insects ... 8 



Discovery of Argon and Helium ... ... ... ... 9 



To Catch Earth-worms . ... ... ... 22 



British Hydrachnidae ... ... . ... ... 23 



Observations on the Morphology of Species of the Genus 



Criex ... ... ... ... ... ... 2e 



Revival of an Old Histological Method ... ... ... ^1 



Notes on GryphcBa Incurva ... ... ... ... 47 



The Cucumber and Potato Eel worm ... ... ... 52 



Energy of Living Protoplasm ... ... ... ... 56 



Flatw^orms, Mesozoa, etc. ... ... ... ... 57 



A Resume of the Uses of Formalin ... ... ... 66 



Displacement of Spines ... ... ... .. ... 75 



Review of the Golgi Method ... ... ... ... 76 



Microscopical Technique ... ... ... ... 86 



Preservation of Structures by Formalin ... ... 86 



Bleaching Vegetable Sections ... ... ... 86 



Oil of Cassia as a Medium ... ... ... ... 86 



Structure of Yeast ... ... ... ... ... 87 



Detection of Cholera Bacillus ... ... ... 88 



Stains for Vegetable Tissues ... ... ... ... 89 



Staining Tubercle Bacilli ... ... ... ... 89 



Cement for Slides ... . . ... ... ... 89 



Biological Water Analysis ... ... ... ... 90 



Identification of Pectic Substances ... ... ... 90 



To Stain Wood Black ... ... ... ... 91 



Preservation of Microscopic Sections ... ... 91 



Glycerine Jelly ... ... ... — ... 92 



Reviews ... ... ••• ... ••• ... 93 



The Postal Microscopical Society 



Founded in 1873. 



The purpose of this Society is to encourage the circulation, 

 study, and discussion of Microscopic Objects, and also to promote 

 the pursuit of Natural Science among its members. 



All Microscopists, Ladies or Gentlemen, who are able to offer 

 good Slides for examination, and will endeavour to contribute to 

 the usefulness of the Society, are eligible for election as members. 



Each member is entitled to a copy of The Journal of Micro- 

 scopy and Natural Science, quarterly, as published. 



The Honorary Secretary will be pleased to send a copy of 

 Rules and any further information which may be required. 



CASES FOR BINDING LAST AND ALL EARLIER VOLS. 

 OF JOURNAL, Price 1/6, Post Free. 



ADDRESS— 

 1 CAMBRIDGE PLACE, BATH. 



