HYGIENIC MANUFACTURE AND PRESERVATION 737 vessels should also be swabbed or washings should be taken and the same examination procedure followed. Particular attention should be paid to the bacteriological condition of filling equipment. Nozzles should be swabbed and pipe lines taken apart and washed through pumps should receive particular attention. All types of packaging material should be examined including cap wads and cartons, especially for the presence of fungi glass containers should be substantially free from bacterial or fungal contamination. The detailed application of the principles outlined here will depend on the intrinsic liability of the product to microbial contamination and the scale of manufacture, type of plant and process. It is therefore virtually impossible to suggest exact routines appropriate for all circumstances. Detailed suggestions are, however, given in Appendix B which may be adapted according to the prevailing requirements.