Although an analyst may be a good microscopist and fully competent to do general bacteriological or biological work, he cannot possibly get a correct microscopical analysis on tomato products unless he is familiar with the Howard method as used by Mr. Howard. This means that he must use the exact technique that Mr. Howard uses in his laboratory. Every manipulation, no matter how slight, must be made in precisely the same manner that Mr. Howard makes it; otherwise the results are worthless. An analyst, in order to be competent to use the method, must either work with Mr. Howard until he can check him on all kinds of samples, or he must work with one of the analysts that have been closely associated with Mr. Howard in this work. If the analyst has had factory experience and can assist the packer in running down the causes of high counts, that is a great advantage. How to Interpret Analyses We will say that a sample of pulp taken from one of the daily runs has been sent to an analyst, and the report on it is as follows: Molds in 70% of microscopic fields. Yeasts and Spores—10 in 1/60th cubic millimeter. Bacteria—12 million per cubic centimeter. What does that analysis mean? The first item means that the analyst examined through the microscope 50 views of a thin layer of the pulp on a slide, and that out of these 50 views, 35 of them contained sufficient mold to count them as positive fields, so that molds were found to be present in 35 out of 50 fields, or in 70% of them. The second item means that from another prepared slide of this pulp (which slide is so ruled that the volume of liquid on any given space of it can be measured) there were found to be 10 yeasts and spores in 1/60th of a cubic millimeter. A cubic millimeter is about ⅕th of a drop, and 1/60th of a cubic millimeter is therefore about 1/300th of a drop—an exceedingly small quantity, almost inconceivable. The best way to conceive it is to think of one drop of pulp mixed in 299 drops of water, and a drop taken from this exceedingly dilute mixture. In this almost inconceivably small amount of pulp there were 10 yeasts and spores. The third item means that in the same slide in which the yeasts and spores were counted there were found to be 12 million rod-shaped bacteria in each cubic centimeter. A cubic centimeter is about 20 drops.