SUPPLEMENT 709 



various comedo-compressors, and by subsequent cleansing of the 

 skin with ether, benzine or spirit. If the eyelids should be affected 

 with blepharitis due to the presence of Demodex in large numbers, 

 epilation and administration of a parasiticide is recommended. 



Demodex folliculorum canis. 



Transmission from dog to man is in any case very rare, and by 

 many its occurrence is generally doubted. Nevertheless Gruby 1 and 

 Remak 2 claim that it is transmissible an opinion which has also 

 been shared by Neumann 3 and Ziirn. 4 The latter saw in the case 

 of a married couple who had the care of mangy dogs the onset of 

 diseased areas on their hands and feet, which were like those on the 

 dogs and contained the same parasites. 



A. Babes 5 also reports several observations which go to show 

 that persons who, to some extent, have been shown to have been in 

 contact with mange-stricken dogs have been attacked by a scabies- 

 like eruption localized over the thorax, abdomen, back and extremi- 

 ties ; large numbers of Demodices were found in the follicular 

 pustules. Lewandowsky 6 reports one case that of an Italian 

 workman, who suffered from an outbreak on the face, like impetigo ; 

 there was crust formation and at the edge of the crusts the epidermis 

 appeared like a narrow row or border of vesicles. A small portion 

 of the covering of the row of vesicles was lifted off, and after slight 

 warming examined in 40 per cent, liquor potassae. In this a large 

 number of animal parasites of the Demodex group were found, and 

 without doubt Demodex folliculorum canis alone. Hunsche 7 assumes 

 that Demodex folliculorum penetrates into the tissues and produces 

 abscesses. 



Treatment first consisted in dusting with zinc amyl powder, but 

 after four days there was no change. After the regular use of xero- 

 form as a powder application, the affection cleared up within 

 fourteen days. 



INSECTA. 



Pediculus capitis (Pediculus capitis) (Head Louse). 



We find Pediculus capitis in very young children and in others 

 more grown up to be the incessant and frequent cause of impeti- 

 ginous crust-forming eczemas. It is more frequent in girls than in 



1 Gruby, quoted by Lewandowsky. 2 Remak, ibid. 



3 Neumann, ibid. 4 Ziirn, ibid. 



' Babes, ibid. 



6 Lewandowsky, Deutsch. med. Wochenschr., 1907, xx. 



7 Hunsche, Munch, med. IVochenschr., 1900, xlv. 



