29—further Studies on the Microbiology of Wool the Enhancement of “Mildew” by Soaps and Vegetable Oils

Humidity Requirements for Mold Growth

“…In table 3 of this report it will be noted that in five weeks there was growth on nutrient-treated wool at 92 percent R.H., but onuntreated wool growth occurred only at 96 per cent R.H. and above. These results are practically identical with those of Burgess (1929). In a period of 20 weeks, however, growth was observed on wool at 85 per cent R.H.…”

“…The raw cotton tested by Prindle (1937) contains moistureabsorbing substances which are removed in processing. In a like manner, Burgess (1929) observed that wool which was treated, with soap mildewed at 91 per cent R.H. while untreated wool mildewed only at 97 per cent R.H. and above. In table 3 of this report it will be noted that in five weeks there was growth on nutrient-treated wool at 92 percent R.H., but onuntreated wool growth occurred only at 96 per cent R.H. and above.…”

Fungi in Relation to the Degradation of Woolen Fabrics

“…The role of the common air and soil borne molds in relation to woolen materials is very vague, though several workers have given incidental attention to the identity of organisms isolated from or growing on wool. Burgess (1924) emphasized the role of bacteria, stated that it was common knowledge that molds also grow on wool, but obtained mostly negative results when molds were placed on sterile (presumably interval steaming) commercially scourecl wool.…”