LABORATORY AND TEACHING METHODS 667 



iodine-potassium iodide and returned to the cj'anide bath. It is then passed tlirough 

 pure water and dried face up on blotting paper in a place free from dust. 



Bibliography. — For details the student is referred to a book by W. H. Walmsley, 

 entitled, The A B C of Photomicrography. A Practical Handbook for Beginner. 

 New York, Tennent and Ward, 1902. 



Complete details will be found in Erw. F. Smith's Bacteria in Relation to Plant 

 Diseases, Vol. i: 130-151; Barnard, J. Edwin: Practical Photomicrography, 1911: 

 xii -f 322, London, Edward Arnold; Hind, H.Lloyd and Randles, W. Brough: 

 Handbook of Photomicrography, 1913: xii + 292 with 44 plates. New York, E. P. 

 Dutton & Co. 



Lesson 46 



The course in mycology will not be complete without the introduction of 

 field trips and excursions which supplement in an important way the laboratory 

 and lecture work, and which will show the student how mycology touches 

 practically the sciences of bacteriology, chemistry, engineering, and the other 

 technologic sciences. Besides the trips into the woods and fields for various 

 kinds of fungi and to the market houses to collect the fungous diseases of the 

 food plants sold there, trips can be planned to include slaughter houses, cold 

 storage plants, meat extract factories and dairies where the cooling, filtration, 

 Pasteurization, and bottling of milk can be demonstrated. Mushroom farms 

 should not be omitted, nor should the farms where vaccine and other biologic 

 products are made be overlooked. Cheese, butter, oleomargarine and soap 

 factories should be included in the schedule, as well as the sugar refineries. 

 The industrial plants where yeasts are employed should be investigated, such 

 as bread bakeries, beer breweries, wine and pressed yeast factories. The estab- 

 lishments where pickles, sour krout and vinegar 'aTE^made should not be omitted. 

 The disposal of the sewage of our large cities will pay inspection. The con- 

 servation of manure in the city and on the farm, the general problems of soil 

 mycology and the preparation of silage ought to be introduced by the field 

 trips. The health laboratories of our large cities should be included in the 

 itinerary. These are only a few of the places that might be visited profitably 

 near such large cities as Boston, New York, Philadelphia, Baltimore, Chicago, 

 St. Louis, New Orleans, Denver, and San Francisco, and smaller places where 

 manufacturing is important. 



References 



Bergey, D. H.: The Principles of Hygiene, Philadelphia, 1914. 

 CouN, H. W.: Bacteria, Yeasts and Molds in the Home, New York, 1903. 

 Fuhrmann, Dr. Franz: Vorlesungen iiber technische Mykologie, Jena, 1913. 

 GiLTNER, Ward: Laboratory Manual in General Microbiology, New York, 1916. 

 Kossowicz, Dr. Alexander: Einfiihrung in die Mykologie der Gebrauchs-und 



Abwasser, Berlin, 19 13. 

 Kossowicz, Dr. Alexander: Einfiihrung in die Agriculturmykologie, Berlin. 



