Jan. 19,1924 
Influence of Low Temperatures on A scans Eggs 
175 
infection by a mechanical action in holding eggs in frozen soil and 
thus inaccessible to swine. 
Both an aqueous 5 per cent carbolic acid solution and 3 per cent 
cresol in a compound soap solution (U. S. liquor cresolis compositus) 
destroyed the capability of development in fresh and partially developed 
eggs and destroyed the activity of developed embryos. This was accom¬ 
plished in 10 hours by the first disinfectant and in 5 hours by the second, 
when the eggs were completely immersed in the liquids. Under condi¬ 
tions as nearly analogous as possible to those in sanitary pens in which 
pigs are kept, the efficacy of the disinfectants was assured if the mixture 
of eggs and sawdust was thoroughly raked over and sprayed four times 
on each of two consecutive days. From these results it appears that 
phenol and cresol disinfectants may prove of value in helping to destroy 
Ascaris infection in pens and buildings under special conditions. The 
mechanical action of thorough scrubbing and cleaning and the heat of 
scalding water which should be used in cleaning are of great importance 
in the destruction of Ascaris eggs, and the destructive action of chemicals 
alone should not be expected to replace these measures. 
LITERATURE CITED 
(1) Bataillon, E. 
1901. LA PRESSION OSMOTIQUE ET LES GRANDS PROBL^MES DE LA BIOLOGIE. 
In Arch. Entwickelungsmech. Organ., Bd. n, p. 149-184, pi. 5. 
Bibliographical footnotes. 
(2) Braun, Max. 
1906. the animal parasites op man. Ed. 3. xix-f- 453 p., 294 fig. London. 
(3) G alu-Valerio, B. 
1914. NOTES DE PARASITOLOGIE ET DE TECHNIQUE PARASITOLOGIQUE. In 
Centbl. Bakt. [etc.], Abt. i, Originate, Bd. 75, p. 46-53, 5 fig. 
(4) Kobayashi, H. 
1919. resistance op the egg op ascaris against pormaldehyde. In 
Mitt. Med. Hochsch. z. Keijo, p. 37-46. 
(s)-• 
1921. resistance op the eggs op helminthes against various external 
conditions. In Mitt. Med. Hochsch. z. Keijo, vol. 4, p. 21-31. 
(6) Leuckart, Rudolf. 
1876. DIE menschlichen parasiTEN. Bd. 2. Leipzig. 
(7) Martin, H. M. 
1922. the common intestinal roundworm op swine. Nebr. Agr. Exp. Sta. 
Circ. 17, 11 p., 3 fig. References, p. 11. 
(8) Ransom, B. H., and Foster, W. D. 
1920. OBSERVATIONS ON THE LIPE HISTORY OP ASCARIS LUMBRICOIDES . U. S. 
Dept. Agr. Bui. 817, 48 p., 6 fig. Bibliography, p. 45-47. 
(9) Wharton, Lawrence D. 
1915. THE DEVELOPMENT OP THE EGGS OP ASCARIS LUMBRICOIDES. In Phil. 
Jour. Sci., sec. B, v. 10, p. 19-23. 
(10) WlGDOR, M. 
1918. SOME STUDIES ON THE RESISTANCE OP THE OVA OP TOXASCARIS LIMBATA. 
In New Orleans Med. and Surg. Jour., v. 71, p. 264-281. 
(n) Yoshida, Sadao. 
1920. on the resistance op ascaris Eggs. In Jour. Parasitology, v. 6, p. 
132-139. 
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