758 
INDEX. 
Diazochlorobenzol, 705. 
Diazodibromobenzol, 704. 
Diazoiodobenzol, 706. 
Diazonaphtol, 716. 
Diazonitranisol, 715. 
Diazonitrobenzol, 707. 
Diazotoluol, 714. 
Differential equations, 733 (see Boole). 
Dynamic radiation of heat by gases, &c., 216. 
E. 
Equations, real and imaginary roots of, 579; theory of a general class of, 591 (see Sylvester). 
Ethaniline, action of nitrous acid on nitrate of, 694. 
F. 
Fairbairn (W.). Experiments to determine the effect of Impact, Vibratory Action, and long-continued 
Changes of Load on Wrought-iron Girders, 311. 
Flint implements, geological age of deposits containing, 247 (see Prestwich). 
G. 
Girders, wrought-iron, effect of impact, &c. on, 311 (see Fairbairn). 
Griess (P.). On a new Series of Bodies in which Nitrogen is substituted for Hydrogen, 667.— 
Part I. Compounds of diazobenzol, 668 ; compounds with organic bases, 678 ; with amido-acids, 
680; imidogen- compounds, 681; products of decomposition of diazobenzol -compounds, 683. 
Part II. Compounds similarly derived from bromaniline, &c., diazobromobenzol, &c., 695. 
Part III. Investigation of the possibility of forming similar derivatives from diamido-compounds, 
719; action of nitrous acid upon benzidine, 719. 
II . 
Haig (R. W.). Account of Magnetic Observations made in the years 1858-61 inclusive, in British 
Columbia, Washington Territory, and Vancouver Island, 161. 
Haughton (S.). On the Joint-systems of Ireland and Cornwall, and their Mechanical Origin, 393. 
(For Contents, see p. 393.) 
Heart, arrangement of the muscular fibres in the ventricles of the vertebrate, 445 (see Pettigrew). 
Herschel (J. F. W.). Catalogue of Nebulae and Clusters of Stars, 1. 
Huggins (W.). On the Spectra of some of the Chemical Elements, 139. 
On the Spectra of some of the Nebulae, 437. 
— and Miller (W. A.). On the Spectra of some of the Fixed Stars, 413. — Introduc- 
tion, 413; apparatus and methods, 415; observations on the moon and planets, 419; on the fixed 
stars, 424; general observations, 429. 
I. 
Idiots, brains of, 551 (see Marshall). 
