448 
Book  Reviews. 
(Am.  Jour.  Pharm. 
I  September,  1907. 
Wellcome's  Photographic  Exposure  Record  and  Diary, 
1907.  New  York,  London,  Montreal,  Sydney,  and  Cape  Town  : 
Burroughs,  Wellcome  &  Co.    50  cents. 
This  is  one  of  the  neatest,  most  compact  and  useful  books  that 
we  have  seen,  and  contains  information  on  the  following  subjects  : 
Weights  and  measures;  temperature  chart;  table  for  focussing 
by  scale ;  customs  regulations ;  development  by  time,  machine, 
tank  or  stand  methods  ;  intensification  and  reduction;  toning  with 
gold,  platinum,  copper  and  by  the  sulphide  method  ;  ruled  pages  for 
recording  negative  exposures ;  ruled  pages  for  recording  positive 
exposures ;  diary  for  the  year ;  memoranda  pages ;  monthly  light 
tables,  giving  the  relative  value  of  the  light  at  all  hours  of  the  day 
and  throughout  the  year  ;  Wellcome's  exposure  calculator.  The 
Exposures  at  Home  and  Abroad  constitutes  a  simple  but  exhaustive 
treatise  on  the  principles  and  practice  of  correct  exposure  in 
various  countries,  illustrated  by  an  entirely  new  series  of  examples. 
Exposures  in  interior  work,  in  telephotography,  in  copying,  reduc- 
ing and  enlarging,  in  contact  printing  by  artificial  light  and  for 
moving  objects,  are  dealt  with  in  special  tables. 
Plate  speed  tables  give  the  speeds  of  over  200  plates  and  films. 
They  are  the  fullest  published  and  contain  information  unobtainable 
elsewhere. 
Tablet  Manufacture.  Its  history,  pharmacy  and  practice.  By 
Joseph  R.  Wood.  Philadelphia  and  London  :  J.  B.  Lippincott  Com- 
pany.     1906.'    224  pp.  $2.50. 
This  work,  containing  twenty-three  illustrations,  consists  of  the 
following  chapters :  History  of  Compressed  Tablets ;  Moulded 
Tablets ;  General  Considerations ;  Triturating  ;  Mixing,  Granulating 
and  Drying;  Lubricating;  Compressing;  Coloring;  Construction 
of  Formulas  ;  Treatment  of  Individual  Substances;  and  a  Formulary 
for  Making  7,000  Kinds  of  Tablets. 
It  is  fortunate  for  the  pharmacist  and  manufacturer  of  tablets  that 
this  book  has  been  written.  It  contains  much  useful  information, 
representing  the  results  of  the  author's  experience,  and  will  save 
the  beginner  much  time.  It  also  will  be  found  of  value  to  the  larger 
manufacturer,  as  it  contains  numerous  hints  of  a  practical  character 
that  may  save  time  in  experimentation. 
Taking  it  all  in  all,  Wood's  book  is  one  of  a  series  of  monographs 
that  everyone  engaged  in  the  manufacture  of  tablets  should  have. 
