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Home > Art, Film & Photography > An Investigation of the Louse Problem
An Investigation of the Louse Problem

An Investigation of the Louse Problem


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About the Book

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1919 Excerpt: ... chemicals have nearly the same volatility, the difference in chemical activity is entirely masked by the changes in toxicity due to changes in volatility. An examination of the louse problem shows four different methods by which a pediculicide may be applied; first, direct contact of the chemical; second, sachets; third, louse powders; fourth, impregnation of the underwear. Direct Contact Of The Chemical Many different chemicals have been recommended to be rubbed along the seams of the clothing to destroy lice and their eggs. Some of these compounds are for the purpose of killing by direct contact, while others are thought to act as repellants. Almost any active liquid chemical with a boiling point above 160 C. and below 250 C. will destroy lice and their eggs when brought into direct contact with them; hence no special investigation of this phase of the problem was made. Cresol or lysol are possibly the cheapest of the chemicals which might be used for this purpose. Inasmuch as all the lice and nits would not be reached by this method, and since it would not protect from reinfestation, it can not be recommended as an effective method of louse control. Concerning the use of repellants, observations with many chemicals throughout the experiments show that those compounds which acted as repellants were actual poisons, present in too small quantities actually to kill the lice, or very slow in action, due to a very low volatility. It appears very doubtful if a compound repellant to lice exists which, under more favorable conditions, would not actually kill them. Use Of Sachets Primitive man protected himself from different ills and evil influences by wearing a charm suspended from the neck, while modern man continuing the same method, has substituted a bag of ...


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Product Details
  • ISBN-13: 9781152343689
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 28
  • Spine Width: 2 mm
  • Width: 189 mm
  • ISBN-10: 1152343688
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 68 gr


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