19101 RURAL KNGINEERING. 881 



disease as it affects adults statiouury within tlie flock, males should not be 

 allowed to run with the females except during the breeding season. The 

 adoption of this policy can work no injury, and may contribute very much 

 to the ultimate elimination of bacillary white diarrhea. A trial period of a 

 year or two should suffice to enable us to determine the full value of the plan." 



The chicken pox, roup, and canker problem in New Jersey, W. C. Thomp- 

 son {New Jersey Stas. Hints to Poultrymen, 7 (1919), No. 11, pp. 4). — The 

 author discusses the status of these diseases in flocks in New Jersey, together 

 with symptoms, effects, causes, treatment, and prevention. 



On the life history of the chicken cestode, Hymenolepis carioca, J. E. 

 GuBEKLET {.Jotir. Parositol., 6 (1919), No. 1, pp. 35-38, pi. 1). — This is a report 

 of studies conducted at the Oklahoma Experiment Station in continuation of 

 work previously noted (E. S. R., 35, p. 577). 



The work has demonstrated experimentally tliat the stable fly may trans- 

 mit this tapeworm (H. carioca) to chicks. "This thread-like worm, according 

 to the above observations, seemed to be most numerous during the late summer 

 and fall at the seasons of the year when Stomoxjjs calcitrans are very abundant. 

 During the autumn this species of fly is less active, and consequently is more 

 easily taken by chickens. Experimentally infesting chicks with H. carioca 

 through feeding infested stable flies iS. calcitrans under control conditions 

 makes it evident that this species of fly may be the intermediate host of this 

 species of chicken cestode." It is pointed out that three other of the six 

 species of fowl tapeworms found in the United States have been demonstrated 

 experimentally to be thus transmitted to chickens, namely, D. proglottina 

 through the slug Limax cinerus by Grass! and Rovelli ; Choanotaenia infundi- 

 huliformis through the common house fly by the author; and D. cesticiUus, 

 which has the house fly as its intermediate hast, by Ackert, in 1918. 



On the life history of Davainea tetragona, a fowl tapeworm, J. E. Ackebt 

 (Jovr. Parasitol., 6 (1919), No. 1, pp. 2S-3-i). — This is a report of studies con- 

 ducted at the Kansas Experiment Station in continuation of previous work 

 (E. S. R., 41, p. 685). 



Flies that had been trapped in poultry yards infested with D. tetragona and 

 other tapeworms were fetl, many of them alive, to young chicks reared in a 

 screened house. At the end of two months an examination of the chicks 

 showed three to contain mature tapeworms, several with embryos. In 12 

 control chicks, the feed of which v.'as free from animal tissue, no parasitic 

 worms were found. 



" Flies eat both onchospheres and egg masses of I), tetragona, and neither 

 when ingested are lost by regurgitation or passed through the digestive tract 

 unaltered. As common house flies from infected poultry yards constituted the 

 only difference between the food given to the experimental chicks and that fed 

 to the control chicks,- evidently D. tetragonn may be transmitted from one 

 fowl to another by M. domestic^." 



RURAL ENGINEERING. 



Geology and ground waters of the western part of San Diego County, 

 Cal., A. J. Ellis and C. H. Lek (U. 8. Gel. Surveij, Water-Supply Paper 446 

 (1919). pp. 321, pis. 47, figs. iS).— This report, pi'epared in cooperation with the 

 State of California and the city of San Diego, deals with the geology and ground 

 waters of that part of San Diego County, Cal., which is drained directly into 

 the Pacific Ocean, and embraces an area of about 3,000 square miles. 



The area consists of a mountainous highland area and a narrow belt along 

 the shore characterized by broad, flat-topped sea terraces. The soil of all the 



