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Abstract: At the instance of Dr. C. Treschow I commenced last summer a number of experiments on mixing penicillin waste products with strawy horse manure. This substance is the by-product from the growth of the Pénicillium fungus for penicillin production. It contains Pénicillium mycelium, organic mushroom nutrients, ordinary plant nutrients and growth substances, for instance three times as much vitamin Bl as ordinary yeast. In a mixture with straw or a strawy horse manure it promotes breakdown of cellulose. Temperatures up to 80°C. (176°F.) were recorded two or three days after the mixing and a similar rise of temperature followed a renewed addition of water a fortnight after the mixing. The evolution of heat is thus great and of long duration. The by-product appears like a pulpy greyish-yellow mass with 20—24% of dry matter. The contents of plant nutrients in the dry matter are: 3-68% of total nitrogen, 4-39% of phosphorus (equal to 10%, of P2O5), and 2-30% of potassium (equal to 2-8%, of K30). Approximately one seventh of the nitrogen is present as ammonia and the rest as proteins.
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