CIiEhIISTRY AND INDUSTRY
to tlic nunibcr of ntonis in thc iiiolecule appcnrs, how-inorganic chemistry, nnd ends with a usefill treatment cvcr, to bc very nrbitrary, espccinlly mhcn this niiiiibcr of dipole nssocintion, adsorption nnd tlie licrr cffcct. is nR high as ciglity-six (cf. p. 91).
Thc lnst chapter contains a short, and riitlicr inridcquatc The book is pqckcd with vnluiible nncl cnrefully revicw of methods of cnlculnt,ing intcrniolccnlnr forces, arrnnged infonnntion covering a midc rnngc, and , whilc cnlculations of elic potentiiil cncrgy of various contnins a very cxtcnsivc bibliography. l'hc chapters dipole systcnis nrc to bc foitnd in thc nppcndis. The on orgnnic crvstnls and on tlic structiirc of colloidal and book is \veil printcd. and its gcncrnl nrr:in~eincnt lcnvcs umorihous sGbstnnces will bc of spccinl intcrcst to the gcncrnl rendcr, while the discussion of factors aflccting crystal strncturc, contnincd in t;hc last chnpter, is nn outstandingly ralunblc snmnnry. The book suff c r ~ in some pnrts from being simply n non-critical compilation of facts. This form of prcscntntion is probably not tlic most suitable for tlic non-spccinlist.
Tho print,ing and nrrnngcincnt nre ndmirable, and the test is very gcncrously illustrntcd by diagrams, although ccrtnin of tlicsc nrc orerloadcd with detailthe graphite diagram on p. 28, for exnniplc, looks iinfnnuliar, nnd thnt of cnlcitc (p. 76) might fairly bc described as a crystallographic nightmarc. This difficulty is, however, to somo estcnt inherent in thc subject. A number of misprints nnd niiiior inaccnrncies in the text have also beon noted.