﻿ANNIVERSARY 
  ADDRESS 
  OF 
  THE 
  PRESIDENT. 
  XXxix 
  

  

  the 
  minerals 
  undergoing 
  any 
  change 
  in 
  their 
  outward 
  form; 
  and 
  

   this 
  discovery 
  was 
  rendered 
  complete 
  by 
  a 
  second, 
  namely, 
  by 
  that 
  

   of 
  dimorphism, 
  in 
  which 
  he 
  showed 
  that 
  sulphur 
  has 
  the 
  property 
  

   of 
  ciystallizing 
  under 
  different 
  conditions 
  in 
  two 
  dissimilar 
  forms. 
  

  

  Berzelius, 
  thoroughly 
  appreciating 
  the 
  value 
  of 
  these 
  discoveries, 
  

   invited 
  the 
  young 
  chemist 
  to 
  Stockholm, 
  where 
  in 
  the 
  laboratory 
  of 
  

   the 
  great 
  Swede 
  he 
  spent 
  two 
  years 
  ; 
  and 
  on 
  his 
  return 
  to 
  Germany 
  in 
  

   1822 
  he 
  was 
  appointed 
  Professor 
  of 
  Chemistry 
  at 
  Berlin, 
  and 
  elected 
  a 
  

   member 
  of 
  the 
  Berlin 
  Academy 
  of 
  Sciences. 
  Occupied 
  much 
  with 
  

   crystallography, 
  he 
  greatly 
  improved 
  the 
  goniometer, 
  and 
  thus 
  

   overcame 
  certain 
  objections 
  to 
  his 
  law 
  of 
  isomorphism, 
  proving 
  that 
  

   the 
  inequalities 
  in 
  the 
  corresponding 
  angles 
  of 
  certain 
  crystals 
  are 
  not 
  

   greater 
  in 
  the 
  isomorphous 
  forms 
  than 
  in 
  many 
  of 
  those 
  that 
  possess 
  

   even 
  the 
  same 
  chemical 
  composition. 
  

  

  The 
  researches 
  of 
  Professor 
  Mitscherlich 
  on 
  artificial 
  crystals 
  threw 
  

   much 
  new 
  light 
  on 
  the 
  formation 
  of 
  natural 
  crystals. 
  He 
  also 
  made 
  

   observations 
  on 
  the 
  points 
  of 
  fusion 
  of 
  rocks 
  by 
  heat, 
  and 
  published 
  

   memoirs 
  " 
  On 
  the 
  volcanic 
  phenomena 
  of 
  the 
  Eifel 
  " 
  and 
  " 
  On 
  the 
  

   occurrence 
  of 
  boulders 
  of 
  granite 
  and 
  porphyry 
  on 
  the 
  higher 
  

   Apennines, 
  near 
  Naples," 
  &c. 
  He 
  also 
  published 
  a 
  celebrated 
  manual 
  

   of 
  chemistry, 
  which 
  went 
  into 
  a 
  5th 
  edition 
  in 
  1856. 
  

  

  In 
  1828 
  the 
  Royal 
  Society 
  of 
  London 
  elected 
  him 
  one 
  of 
  its 
  

   foreign 
  members, 
  and 
  in 
  1829 
  awarded 
  him 
  the 
  Royal 
  Medal 
  for 
  his 
  

   discoveries 
  in 
  crystallography 
  ; 
  and 
  in 
  1832 
  he 
  was 
  elected 
  a 
  foreign 
  

   member 
  of 
  this 
  Society. 
  In 
  1852 
  he 
  was 
  elected 
  one 
  of 
  the 
  few 
  

   foreign 
  Associates 
  of 
  the 
  Imperial 
  Academy 
  of 
  Sciences 
  of 
  the 
  Insti- 
  

   tute 
  of 
  France. 
  He 
  died 
  at 
  Berlin 
  in 
  1863, 
  at 
  the 
  age 
  of 
  69. 
  

  

  Though 
  contrary 
  to 
  our 
  custom, 
  I 
  may 
  be 
  pardoned 
  for 
  alluding 
  

   to 
  the 
  death 
  of 
  a 
  gentleman 
  who 
  was 
  not 
  a 
  member 
  of 
  our 
  Society, 
  

   but 
  who 
  contributed 
  several 
  important 
  papers 
  to 
  our 
  Journal. 
  

  

  The 
  Eev. 
  Stephen 
  Hislop 
  was 
  born 
  at 
  Dunse, 
  in 
  Berwickshire, 
  on 
  

   the 
  8th 
  of 
  September, 
  1817. 
  After 
  passing 
  through 
  the 
  schools 
  of 
  

   his 
  native 
  Tillage, 
  he 
  attended 
  the 
  Universities 
  of 
  Glasgow 
  and 
  

   Edinburgh, 
  completing 
  his 
  theological 
  studies 
  at 
  the 
  New 
  College 
  in 
  

   the 
  latter 
  city. 
  He 
  went 
  out 
  as 
  a 
  missionary 
  to 
  Nagpore, 
  in 
  Central 
  

   India, 
  during 
  the 
  latter 
  part 
  of 
  1844. 
  Prom 
  his 
  youth 
  up 
  he 
  had 
  

   always 
  given 
  more 
  or 
  less 
  attention 
  to 
  geology 
  ; 
  but 
  it 
  was 
  not 
  until 
  

   the 
  seventh 
  year 
  of 
  his 
  residence 
  in 
  India 
  that 
  he 
  commenced 
  the 
  

   series 
  of 
  researches 
  which 
  terminated 
  only 
  with 
  his 
  death. 
  "When 
  

   walking 
  with 
  his 
  colleague 
  in 
  June 
  1851, 
  about 
  two 
  miles 
  from 
  

   y.igpore, 
  he 
  unexpectedly 
  came 
  upon 
  a 
  specimen 
  of 
  the 
  Physa 
  

   Prinsepii. 
  He 
  was 
  aware 
  that 
  this 
  and 
  a 
  few 
  other 
  Tertiary 
  mol- 
  

   luscs, 
  sometimes 
  associated 
  with 
  silicified 
  wood, 
  had 
  been 
  detected 
  

   by 
  Dr. 
  Malcolmson, 
  Dr. 
  Spilsbury, 
  and 
  others, 
  in 
  various 
  parts 
  

   of 
  Central 
  India 
  ; 
  but, 
  so 
  far 
  as 
  he 
  knew, 
  the 
  occurrence 
  of 
  fossils 
  

   in 
  the 
  immediate 
  vicinity 
  of 
  Xagpore 
  itself 
  had 
  not 
  previously 
  

   been 
  suspected. 
  Prom 
  this 
  period, 
  whatever 
  leisure 
  remained 
  to 
  

   Mr. 
  Hislop, 
  after 
  the 
  satisfactory 
  discharge 
  of 
  his 
  professional 
  

   duties, 
  was 
  given 
  to 
  geology. 
  Various 
  military 
  friends 
  joined 
  in 
  the 
  

  

  