IN'TUODl'CTORY AND EXPLANATORY. 



7. Platinum chloride, 



8. Palladious chloride. 



9. Gold chloride. 



10. Silver nitrate. 



11. Copper sulphate. 



12. Fehling's solution (alkaline 



copper tartrate). 



Cyanides, etc. : 



13. Potassium ferrocyanide. 



14. ,, ferricyanide. 

 Ih. ,, sulphocyanide. 



16. ,, cyanide. 



17. ,, nitro-prusside. 



18. Silver potassium cyanide. 



Phoapho-componiuh : 



22. Phosphomolybdio acid (.Sonnen- 



schein's reagent). 



23. Phospho-tungstio acid (Schei- 



bler's reagent). 



24. Phospho-antimonic acid. 

 Iodides, etc. : 



25. lodo-potassic iodide (Wagner's 



reagent). 



26. Bismuth-potassic iodide ( Dragen- 



dorff's reagent). 



27. Cadmium - potassic iodide 



(Marme's reagent). 



28. Zinc-potassio iodide. 



29. Mercuric-potassic iodide ( M ayer's 

 solution). 



30. Mercuric chloride. 



31. Chlorine water. 



32. Bromine water. 



33. Iodine tincture. 



Chromales, etc. : 



19. Potassium chromate. 



20. ,, bichromate. 



21. Chromic acid. 

 Colour tests (in this order), time taken for development of colours and their 



durability ; 



Concentrated sulphuric acid alone and with various substances (sugar, potassioni 

 bichromate, manganese dio.\ide, nitric acid, etc.), Erdmann's reagent, sulphuric 

 acid with a trace of nitric acid. 



Concentrated nitric acid alone. 



Acids in general. 



Perchlorate of potash or perchloric acid. 



Per-iodic acid. 



Frohde's solution (molybdic and sulphuric acids). 



PART II. — A Tabular Su.m.mary designed for ready reference and 

 as a means of contrasting one compound with another for analytical and 

 other purposes ; it gives the chief properties and tests of the substances 

 that are more fully described in Part I. 



PART III. — A Cl.\ssification of Reactions for the special use of 

 analysts, showing what compounds are known to respond to a given test. 

 BOTANICAL INDEX. — Each plant here appears in its alphabetical 

 positions by popular and scientific names. Sub-lists of plants are also 

 inserted for those botanical orders which iuclude members containing alka- 

 loidal, bitter, or glucosidal principles. This facilitates comparison of the 

 constituents of allied plants. 



GENERAL INDEX. — Special endeavours have been made to render 

 this comprehensive. 



In the Tabular Sum.mary the order of insertion in Part I. has been 

 preserved, because it permits a survey of all the active ])rinciples of a 

 given plant at a glance — a manifest advantage over a purely alphabetical 

 arrangement (which might upon a preliminary inspection have appeareil 

 desirable), for in that case the reader, dealing, for instance, with Opium, 

 would have had nearly forty different positions to find, whilst here be has 

 but one. 



Synonyms and questions of identity cannot, for want of space, be 

 discussed in Part II. (the Tabular Summary), but receive full attention 

 in Part I. ; for the same reason, many columns of precipitants have had 

 to be removed from Part II. ; but this curtailment is amply compensated 

 for by the classified lists of reactions in Part IIL and the numerous 

 reference notes. 



In the last section — Part III. — are classed, in a series of alphabetical 

 lists, sub.-itances having a common propertj-, or giving a similar reaction. 



GENERAL RULES. 



1^ 1. To facilitate reference, it is important to remember that the 

 series of details upon any substance is invariably given in a particular 

 rotation (see above). 



2. Colour — Since the great majority of substances here dealt with are 

 colourless, colour is only mentioned when coloured compounds are spoken 

 of ; all others are to be understood to be white or colourlest. 



3. Odour. — For analogous reasons, all bodies not described as h'triny 

 odour are odourless. 



4. Alkalinity. — When not otherwise stated, the reaction (alkaline, 

 neutral, or acid) has reference to litmus as indicator. 



5. Temper.\ture is always indicated in degrees Centigrade. 



G. Solubility'. — Figures in the solubility columns denote number of 

 parts of solvent required to dissolve one jjart of substance. 



7. Delicacy of Test. — Numbers in the columns of precipitants (or 

 colour tests) signify degree of dilution at which the reaction is 

 observable. 



8. Use of Re.a.gents. — Except where other indications are given, 

 precipitants are to be applied to the substiitice dissolved in water, and in the 

 case of alkaloids to the salt, and not to the free base. 



9. Colour Tests. — The dry substance is to be employed when testing 

 with concentrated acids and colour tests generally. 



