Am.  Jour.  Pharm.  \ 
August,  1901.  J 
Obituary, 
411 
The  work  consists  of:  Part  I — Equation  Writing;  (1)  General 
Principles  ;  (2  and  3)  Nomenclature,  Notation  and  Classification  of 
the  Elements,  and  Inorganic  Compounds ;  (4)  the  Writing  of  Chemi- 
cal Formulae;  (5)  Construction  and  Interpretation  of  Equations; 
(6)  Oxidation  and  Reduction,  Spelling  and  Pronunciation  of  Chemi- 
cal Terms.  Part  II — Chemical  and  Pharmaceutical  Arithmetic  ;  (7) 
Important  Data  Employed  in  the  Problems  in  Part  II ;  (8)  Calcula- 
tions Based  on  Chemical  Formulae ;  (9)  Calculations  Based  on  Equa- 
tions;  (10)  Calculations  Involving  the  Weights  and  Volumes  of 
Gases;  (1 1)  Calculations  Involving  the  Weights,  Volumes  and  Spe- 
cific Gravities  of  Liquids  and  Solids;  (12)  Percentage  Solutions  and 
Mixtures;  (1 3)  Alligation  or  Adjustment  of  Percentages  and  Spe- 
cific Gravities. 
There  are  a  number  of  new  things  in  the  book,  or  rather  a  new 
way  of  treating  modern  facts  and  theories,  as  in  the  use  of  the  term 
Microcrith ;  the  nomenclature  of  alkaloidal  salts ;  the  theory  of 
doubled  formulae,  etc.  The  book  is  one  which  not  only  beginners 
in  chemistry  will  use  with  profit,  but  teachers  and  others  will  enjoy 
having,  as  there  is  a  good  deal  of  valuable  matter  contained  therein. 
OBITUARY. 
HANS  M.  WILDER. 
Hans  M.  Wilder  was  born  in  the  island  of  Iceland  in  March, 
1 83 1.  His  parents  were  Danes  and  lived  in  the  city  of  Copen- 
hagen, Hans  having  been  born  while  his  parents  were  on  a  visit 
to  Iceland.  He  spent  his  boyhood  in  Denmark,  entering  the  gym- 
nasium when  he  was  five  years  old.  In  his  eleventh  year  he  was 
transferred  to  the  Latin  school.  On  account  of  his  father's  death, 
and  the  straitened  circumstances  of  the  family,  he  was  unable  to 
continue  at  school,  and  he  was  therefore  apprenticed  to  an  apothe- 
cary; at  the  end  of  four  years  he  took  his  junior  examination,  and 
three  and  a  half  years  afterwards  passed  his  Major  Candidatus. 
While  still  a  clerk  in  the  drug  store  his  mother  died,  and  soon  after 
with  a  small  sum  of  money  which  had  been  bequeathed  to  him,  he 
began  to  satisfy  his  roving  disposition,  going  first  to  France,  where 
he  stayed  six  months  with  a  relative  in  Rheims.  After  travelling 
through  France  he  set  sail  for  St.  Croix,  West  Indies,  and  after  be- 
ing here  three  years  he  sailed  for  the  United  States  in  i860,  land- 
