80 EXPERIMENT STATION RECORD. [Vol.43 



chickens both tobacco and lye proved fairly satisfactory. Tobacco is used at 

 the rate of 0.5 teaspoonful to each bird. The tobacco is finely chopped and 

 mixed with feed and cooked for 1 hour, the birds having previously fasted for 

 15 to 20 hours. The lye is used at the rate of 1 teaspoonful to 25 birds. It 

 is mixed with the feetl and cooked for 1.5 hours, the chickens having fasted 

 for 15 hours before being fed the mixture. Both the lye and the tobacco re- 

 moved from 50 to 75 per cent of the worms with a single treatment. A second 

 treatment should be administered after 4 or 5 days. 



The adult taenioid cestodes of dogs and cats, and of related carnivores 

 in North America, M. C. Hall {Proc. U. S. Natl. Mus., 55 (1920), pp. l-9Jt, 

 figs. 80). — This paper includes keys dealing with each taxonomic group, from 

 families to species of a given genus, a host list, and an 11-page bibliograpiiy. 



Studie-s on Acari. — I. The genus Demode.\, S. Hirst {London: Brit. Mua. 

 {Nat. Hist.), 1919, pp. JfJf, pis. 13, fi(/s. Jf,' rev. in Jour. Amer. Vet. Med. Assoc, 

 56 {1920), No. 5, pp. 512, 513). — This is a systematic account of acarids of the 

 genus Demodex, all of which are skin parasites of microscopic size. 



Sixteen species are recognized, of which 13 have been studied by the author. 

 These are D. follicuI07-um from man ; D. canis fi'om dog, and the varieties, D. 

 canis ovis from sheep and D. canis erinacei from hedgehog {Erinacevs 

 europceus) ; D. longior from field mouse {Apodernus sijlvaticus) ; D. cati from 

 cat ; D. pJiylltoides from pig ; D. boris from cattle ; D. equi from horse ; /). 

 muscardini from dormouse {Muscardinns aveUanarius) ; D. erminece n. sii., from 

 stoat {Mustela erminea) ; D. arvicolce from field vole {Microfiis [A^-vicola]- 

 agrestis) and the varieties D. arvifolw musculi from house mouse {Mus mvscu- 

 lus) ; D. arvicolce apodemi from field mouse (A. syh-aticvs) in England, and 

 D. arvicolce glareoli from bank vole {Evotomys ghtreolus britannicus) ; D. 

 cuniculi from rabbit {Oryctolagus cuniculus) ; D. ratti from brown rat {Rattus 

 norvegicus) ; and D. soricinus from black rat {R. rattus) in England, brown 

 rat {R. norvegicus), and shrew {Sorex araneus castaneus) . The three species 

 not seen by the author are D. caprce from goat, D. cervi from Sambar deer 

 {Cervus sp.), and D. phyllostomatis from bat {PhylJostoma hastatum). 



Resistance of Ascaris eggs, Yoshida and Hotta {Abs. in Jour. Aiuer. Med. 

 Assoc, 73 {1919), No. 16, p. 1246). — The authors find that the eggs of Ascaris do 

 not develop in urine, and that if left standing in it for a considerable time they 

 all die. The experiments show that formalin and sulphuric acid do not affect 

 the exterior coating of albumin, but they coagulate the albumin that surrrounds 

 the embryo and thus do not penetrate deep enough to reach the embryo. When 

 the eggs are kept in a solution of glacial acetic acid and nitric acid for a 

 long time, the albuminous membrane decays and the chitinous wall is exposed, 

 but the embryos within the eggs develop as these drugs do not penetrate tlie 

 chitinous membrane. Hydrochloric acid brings about a similar result, but 

 phenol seems to kill the eggs in a shorter time. 



A newly-recognized cause of pulmonary disease, Ascaris lumbricoides, 

 B. H. Ransom {Jour. Amer. Med. Assoc, 13 {1919), No. 16, pp. 1210-1212).— 

 The author here reviews the pre.sent status of knowledge of the biology of 

 A. lumhricoides and the pathological condition caused by it. He emphasizes 

 the importance of investigations of its relation to pulmonaiy troubles in human 

 beings, particularly in young children. Referring to the records of Mosler in 

 1867 and of Lutz in 1888 of the occurrence of pulmonary symptoms in human 

 beings following the experimental administration of Ascaris eggs, he concludes 

 that in the light of our present knf)wledge these symptoms were probal)ly due to 

 the invasion of the lungs by migrating Ascaris larvse. 



Accounts of this pest by the author and Foster have been previously noted 

 (E. S. R., 41, p. 285). 



