414 
Combating Lousiness 
all the available information regarding the methods of combating 
lousiness among troops and civilians for, viewed epidemiologically, they 
must be regarded as forming one body. Much that serves to prevent 
lousiness will also check the all-too-prevalent scabies, both conditions 
being primarily due to neglect of the person, squalor, and filth. Frequent 
inspection, accurate diagnosis, frequent baths and adequate treatment 
cut at the root of both evils. 
The general arrangement of the subject matter is sufficiently indicated 
in the table of contents. The scattered observations of different authors 
have been utilized as far as possible, due credit being given where it 
belongs. A number of unpublished observations of my own are in¬ 
corporated throughout the text, these being duly indicated. A series of 
Reference Numbers accompanies the data bearing on experiments with 
insecticides, they run on into those relating to various remedies that 
have been recommended in practice; these numbers are merely intended 
to facilitate cross references. 
To combat lousiness effectively it is essential to understand the 
biology of the parasites, a subject that has already received exhaustive 
treatment in my earlier papers in this volume of Parasitology (see Biology 
of Pediculus humanus, pp. 80-185, and that of Phthirus pubis, pp. 383- 
405; the relation of lice to disease is described on pp. 43-79, 375-382). 
The reader is referred to these publications. 
I have to express my indebtedness to Sir Alfred Keogh, G.C.B., 
Director General, A.M.S. (now retired), for his help in kindly placing at 
my disposal the unpublished MS. Reports to the War Office by Mr A. Bacot, 
Entomologist to the Lister Institute; Captain C. J. D. Gair, R.A.M.C.; 
Captain J. T. Grant, R.A.M.C.; Lieutenant A. D. Peacock, R.A.M.C., and 
Colonel W. Hunter, A.M.S., of which a digest is incorporated in various 
parts of the text where indicated. I am furthermore under obligations to 
Colonel W. H. Horrocks, C.B., A.M.S., and Major W. C. Smales, R.A.M.C., 
War Office, for the help they have given me in various ways. Finally, 
I have to acknowledge the courtesy of several firms for placing at my dis¬ 
posal the blocks used for printing the illustrations of the different types of 
disinfectors which they have severally supplied to the armies in the field. 
It is hoped that the mass of information here collected for the first 
time will be of benefit in guiding others to fresh discoveries whereby the 
scourge now afflicting our armies may be mitigated. 
This publication deals with part of a general investigation under¬ 
taken in the Quick Laboratory before the war but left incomplete through 
