CLASSIFIED SUBJECT-INDEX 



TO THE 



Principal Contents of the First Twelve Volumes of the Transactions, 



1875 to 1901* 



I. PHYSICAL SCIENCE. 

 Astronomy. 



On Nature (Astronomy and Physics) : Dr. A. T. Brett, Ila, 49. 



Diagram for a Model of the Solar System to Scale : A. Cottam, IV, 97. 

 Earthquakes. 



The Great Essex Earthquake of 1884 : Prof. R. Meldola, IV, 23. 



The Earthquake of 1896 in the County of Hertford: H. G. Fordham, IX, 183. 

 Light. 



Polarisation of Light: J. U. Harford, la, 152. 



The Rontgen or "X" Rays: T. Mansell, IX, 135. 



IVi P'TT'OTtTTFS 



The Meteorite of November, 1887 : H. G. Fordham, V, 33. 



Meteorite observed in Switzerland : H. G. Fordham, VI, 193. 



Fire-ball Meteor seen in Herts : J. Hopkinson, VI, 194. 



Meteor seen at Kensworth : Miss S. G. Jones, X, 68. 

 Mineralogy. 



Physical Characteristics of Minerals : J. U. Harford, Ila, 104. 



Crystals and Precious Stones : G. H. Wailes, VIII, xiii. 

 Water. 



Relative Advantages of Hard and Soft "Water : J. Hopkinson, VIII, 101. 



Advantages of a Supply of Soft Water : A. King, VIII, 116. 



II. METEOROLOGY. 



General. 



Instructions for taking Observations: W. Marriott, la, 211. 

 Reduction of Observations: W. Marriott, Ila, 197. 

 Meteorology and some Connected Subjects : G. J. Symons, III, ix. 

 Application of Photography to Meteorology : A. W. Clayden, VI, 162. 

 The Winter of 1878-79 : W. Marriott, II«, 237. 

 Hertfordshire. 



Climatological Observations, 1887 to 1896 : J. Hopkinson, V, 203, 209 ; 



VI, 77, 187; VII, 157, 199; VIII, 45, 125; IX, 93, 241. 

 Meteorological Observations, 1897 to 1899 : J. Hopkinson, X, 49, 145, 223. 

 The Rainfall of 1875 : J. Hopkinson, la, 112. 



Reports on the Rainfall, 1876 to 1879 : J. Hopkinson, la, 225 ; Ua, 97, 223 ; 

 I, 127. 



, 1880 to 1886: Rev. C. W. Harvey, I, 221 ; II, 64, 249; III, 112, 



247; IV, 73, 214. 

 -, 1887 to 1899 : J. Hopkinson, V, 155, 161 ; VI, 65, 179 ; VII, 53, 203 ; 



VIII, 33, 131 ; IX, 109, 139 ; X, 23, 121, 213. 

 Rainfall in 1840-79 : Rev. C. W. Harvey, I, 151. 



* la and II« indicate the two volumes of the ' Transactions of the Watford 

 Natural History Society' (1875-80), which preceded the 'Transactions of the 

 Hertfordshire Natural History Society ' (commencing 1880). The reports of the 

 Field Meetings are not indexed, except that references are given to lists of 

 cryptogamic plants in them. The publication by the Society of Pryor's * Flora 

 of Hertfordshire ' renders it unnecessary to index lists of flowering plants. 



