164 The N.Z. Journal of Science and Technology. [Aug. 
Chemical Control. (41, 48, 49, 52, 54, 56, 57.) 
This aspect of the subject, while not strictly coming within the scope 
of the chemical technology of the frozen-meat industry, is an important 
factor in maintaining efficiently the manufacturing processes of the in¬ 
dustry so that the quality of the various products and by-products can 
be kept up to the standard and uniformity required. Chemical control 
also scrutinizes the quality of supplies purchased, and exercises supervision 
in regard to guarantees made covering products registered under legal 
enactment, or concerning which Government regulations have prescribed 
standards of quality. 
Apart from the analytical work for the control of products and supplies, 
the field covered by chemistry in the frozen-meat industry is indicated 
clearly by the subject-matter of these articles, and it is unnecessary, there¬ 
fore, to refer further to this phase of the subject. 
Conclusion. 
This article concludes the present series, but at a later date it may be 
possible to review further any developments covering the chemical tech¬ 
nology of one or more of the various branches of the industry. It was 
pointed out in the introduction that no discussion of details or methods 
of working was contemplated, but in the course of writing the articles it 
has not been possible to adhere strictly to this, and, consequently, where 
any suggestion regarding details of methods has been referred to in order 
to illustrate the principle involved, it should be understood that such details 
do not apply specifically to any one factory or group of factories. 
Literature cited. 
1-23. See list at end of Part I, p. 83. 
24-33. See list at end of Part II, p. 107. 
34. Bowman, F. H., Structure of Wool Fibre (Macmillan), 1908. 
35. Procter, H. R., The Making of Leather (Camb. Univ. Press), 1914. 
36. Bennett, H. G., The Manufacture of Leather (Constable), 1909. 
37. Seymour-Jones, A., The Sheep and its Skin, Leather Trade Rev., 1913. 
38. Jacomet, L., Matieres tannantes cuirs (Libreire Polytechnique), 1911. 
39. Wright, A. M., Journ. Soc. Chem. Ind., vol. 28, pp. 1020-22, 1909. 
40. Wright, A. M., Journ. Soc. Chem. Ind., vol. 27, p. 3, 1908. 
41. Wright, A. M., Journ. Soc. Chem. Ind., vol. 28, pp. 124-25, 1909. 
42. Thorpe, T. E., Wool, Diet. Appl. Chem., 1913. 
43. Thorpe, T. E., Water, Diet. Appl. Chem., 1913. 
44. Thorpe, T. E., Sewage, Diet. Appl. Chem., 1913. 
45. Kinnicutt, L. P., and others, Sewage Disposal (Wiley), 1919. 
46. Thresh, J. 0., Water and Water-supplies (Churchill), 1904. 
47. Harvey, A., Practical Leather Chemistry (Crosby Lockwood), 1920. 
48. Official and Tentative Methods of Analysis (Association Official Agric. Chemists). 
1920. 
49. Dierbach, R., Der Bdriebs-Cliemiker (J. Springer), 1908. 
50. Ardern, E., Journ. Soc. Chem. Ind., vol. 36, p. 822, 1917. 
51. O’Shaughnessy, F. R., Journ. Soc. Chem. Ind., vol. 33, p. 3, 1914. 
52. Regulations, N.Z. Food and Drugs Act, 1908, N.Z. Gazette, p. 761, 1913. 
53. Stabler, H., and Pratt, G. H., Purification of some Textile and other Factory 
Wastes, U.S. Geol. Surv. Water-supply Paper 235. 1909. 
54. Lowenstein, A., Journ. Ind. and Eng. Chem., vol. 7, pp. 942-44, 1915. 
55. Baskerville, C., Municipal Chemistry (McGraw-Hill), 1911. 
56. Jago, W., Forensic Chemistry (Stevens and Haynes), 1909. 
57. Forcrand, R. de, Chimie legale (Dunod et Pinat), 1912. 
