Abstract
Studies on cockroaches have been limited largely to their habits, physiology and biology, and methods of control. However, the use of the cockroach, Blatella germanica , as an assay animal for nutritional studies has been proposed recently. Noland, Lilly, and Baumann (1949) studied the nutritional requirements of the cockroach, using test tubes and about five nymphs to a cage. Reproducible results were obtained when growth was measured by weighing each group to within 0.5 mg. at ages of 10, 20, and 30 days. Daily records were kept of age and sex of maturing individuals. House and Patton (1949) reared B. germanica under aseptic conditions, using cages constructed from Kolle flasks. The nymphs were weighed individually and growth evaluated by weight increment. House (1949) developed a chemicallydefined diet by this method. Gier (1947) reared Periplaneta americana in glass culture dishes at 30° C, feeding the stock colony Purina Dog Chow Pellets. He found that this roach has 10 instars and that there are 16 eggs in the normal oothecum. Gould and Deay (1938) studied the biology of the American cockroach, rearing them in battery jars and feeding raw potato. Gould and Deay (1940), and Bottimer (1945, found dog biscuits and pablum satisfactory for raising cockroaches.
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