The effect of changes in the osmotic pressure uponHammerschmidtiella diesingi(Hammerschmidt, 1838) with reference to the survival of the nematode during moulting of the cockroach

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Abstract
Females ofHammerschmidtiella diesingican survive in the hind-gut of moultingBlatta orientalis. After a period of shrinkage they recover their normal length within 24 hr. in 0·2 and 0·3msodium chloride and in 50% sea water, but not in hypotonic media or in hypertonic sucrose. Females ofH. diesingi, which have regained their original length in hypertonic media, swell when placed in normally isotonic media; a similar phenomenon occurs with nematodes taken from moulting cockroaches.