54 MAINE AGRICULTURAL EXPERIMENT STATION. I915. 



from liioe ancli other in.s'ccts. It will 'be noted that these miaterialg 

 differ quite widely in their composition and they doubtless vary 

 greatly in their efficiency. The tabulated results are given on 

 pages 37, 38 and 39. 



Sheep Dips. Only one of the sheep dips olTered in Maine 

 contained water soluble arsenic. It is doubtful if this is anv 

 more effective than the sheep dips which depended upon hydro- 

 carbons for their efficieaicy and the latter are far safer to use. 

 The results are given in the table on page 39. 



Insecticides for Flies on Cattle in Stables, etc. There are a 

 good many of these brands on sale in the State. They are all 

 quite alike, depending upon the mixture of vegetable oils, hydro- 

 carbons, crude petroleum and coal tar derivatives for their 

 repelling powers. They are all more or less effective. Where 

 flies are very numerous, unless very frequently used they lose 

 their efficiency. The tabulated results are given on page 40. 



Insecticides for Roaches. Most of the insecticides prepared 

 for roaches are also intended for rodents, which probably ac- 

 counts for there being so many brands on sale in Maine. Maine 

 has no true roaches. It will be noted that some of these are 

 called "rat and roach exterminators." They would not come 

 under the insecticide law if it were not for the claims which 

 are 'made upon tihein for roaches. The results of the exami- 

 nation! of these are given on pages 41 and 42. 



Remedies for Head Lice. Extract of larkspur is the standard 

 remedy for head lice and is sold for this purpose by all druggists. 

 There are a few proprietary articles put up for this purpose 

 which consist essentially of larkspur. The results of the exam- 

 ination are given on page 42. 



Bed Bug Insecticides. These consist of poisonous materials 

 and of hydrocarbons, benzine, etc., which kill by contact. Most 

 of those listed will be fairly effective for slight infestations. 

 They would probably not clean up a house that was badly 

 infested. For that purpose a really effective remedy seems to 

 be a poisonous gas., which can only be used with the greatest 

 care because of its danger to human life. To anyone desiring 

 it a circular on bed bugs describing all remedies will be sent on 

 application. The results of the examination are given on page 

 43- 



