. Circular. Insect pests; Insect pests. 11 a needle moistened in glycerine and transferred to a glass slide. Search with the microscope disclosed the presence of a mite of very minute dimensions. The mite was identified for them by Mr. Nathan Banks, expert in Acarina of the Bureau of Entomology, United States Department of Agriculture, as very close to, if not identical wdth, the Pediculoides ventricosus. In order to demonstrate experimentally the etiological relation- ship of the suspected straw mattresses. Doctor Goldberger exposed his bared left arm and shoulder for one hour between two mat
. Circular. Insect pests; Insect pests. 11 a needle moistened in glycerine and transferred to a glass slide. Search with the microscope disclosed the presence of a mite of very minute dimensions. The mite was identified for them by Mr. Nathan Banks, expert in Acarina of the Bureau of Entomology, United States Department of Agriculture, as very close to, if not identical wdth, the Pediculoides ventricosus. In order to demonstrate experimentally the etiological relation- ship of the suspected straw mattresses. Doctor Goldberger exposed his bared left arm and shoulder for one hour between two mattresses. At the end of about sixteen hours, a num- ber of characteristic lesions appeared upon the arm,shoulder, and chest. Later, three volunteers slept upon the mattresses and each one developed the eruption at the end of about the same period. Doctor Goldberger later took some of the sifted straw, divided it into two portions, and placed it in two clean Petri glass dishes. One of these was applied for one hour to the left axilla of a volunteer. At the end of from sixteen to seventeen hours the characteristic erup- tion was present in the area of the left axilla to which the Petri dish of strav/ siftings had been applied. The second portion of the straw siftings in a Petri dish was exposed to the vapor of chloroform under a bell jar with a view to killing any insect or acarine that might be present. These siftings were then applied to the right axilla of the same volunteer to whose left axilla the untreated siftings had been applied. The chloroform evidently destroyed in the siftings the agent tliat was producing the eruption, for no lesions appeared after the application of the cldoroformized siftings. [Cir. 118]. Fig. 7.—Lesions caused by bites of the mite Pediculoides ventricosus. In this case the effect is entirely different from that shown in any of the other figures, the lesions not only covering the body, including the arms, but extending over the face and forehead;
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectinsectp, bookyear1904
