Gf. H. F. Nuttall 
509 
References: B. = Bacot, ix. 1916, pp. 447-450; B. 2 = Bacot, MS. Report, W. O. 
I. 1918; H. = Heymann, 8. in. 1915, pp. 253-4; M. = Machold, 1915, p. 645; O. = 
Orticoni, 1915, p. 49; P. = Pregl, 1915; R. = Ragg, 1915, p. 176; Ren. = Renault, 
1915, p. 206; Rep. = Report, 1915, pp. 53-58; S. & F. = Sergent and Foley, 1915, 
p. 49; S. = Swellengrebel, 1916, pp. 16-29; W. = Wesenberg, 1915, p. 861, cited 
by Swellengrebel, 1916, p. 28. 
Experiments upon the relative efficiency of various Insecti¬ 
cides, conducted by A. Bacot (MS. Report, W.O. i. 1918). 
In experiments (Nos. 286-310) small quantities (0-2-0-22 g.) of the 
preparations were evenly spread, dusted or sprinkled over the surface 
of pieces of flannel measuring 6 square inches. The lice were confined 
upon the flannel by a cover of fine gauze (chiffon) which was stitched to 
the treated surface of the fla nn el. The latter was then pinned to the 
experimenter’s shirt with the gauze next .to his skin, thereby enabling 
Ref. 
Insecticide tested 
Time v 
Results 
r hen flannel treated before lice put on it 
No. 
(vapour and contact) 
1 hr 
24 hrs 
48 hrs 
65 hrs 
Exposure 
4^ hrs 
hrs 
4^ hrs 
10£ hrs 
104 hrs 
104 hrs 
286 
Oxford grease 
O 19/20 alive 
O 20/20 alive 
O 19/19 alive 
287 
Vermijelli 
— 
0 19/19 „ 
— 
0 19/20 „ 
0 20/20 „ 
— 
288 
Naphthaline, crude, and Oxford 
grease, 1 : 3 
± 19/20 dead 
— 
O 20/21 alive 
0 20/20 „ 
— 
289 
Parasitox, crude, after heating to 
120-130° F. 
+ 19/19 „ 
— 
± 4/20 dead 
~~ 
O 20/21 „ 
— 
290 
291 
Naphthaline, crude, unwhizzed* 
and soft soap, 9 : 1 
Naphthaline, crude, 17-5 %4 ^ 
+ 21/21 „ 
±19/21 „ 
± 3/21 dead 
Safrol 1-5 % ]-l pt 1 
Oxford grease 80 % J 
Chlor-cresol lpt J 
+ 20/20 „ 
— 
O 19/20 alive 
— 
— 
O 20/20 alive 
292 
Naphthaline, crude, and soap emul¬ 
sion, 1 : 1 
+ 20/20 „ 
— 
± 4/21 dead 
O 20/20 ,, 
293 
Naphthaline, crude, 85 % 
Soft soap 10 % 
Kieselguhr 5 % 
+ 19/19 „ 
+ 20/20 „ 
O 20/20 „ 
294 
Naphthaline, crude, 17-5 % 
Safrol 2-5 % 
Oxford grease 80 % 
±20/21 „ 
± 2/22 „ 
0 21/21 „ 
295 
Naphthaline, crude, 17-5 %) -, , 
Oxford grease 80 % j 1 P 
Chlor-cresol 2-5 % 1 pt 
+ 20/20 „ 
— 
O 18/18 alive 
— 
4j hrs exposure 
0 21/21 „ 
296 
Naphthaline, crude, 47 % 
Carbolic acid 2£ % 
Oxford grease .50 % 
+ 21/21 „ 
± 7/21 dead 
O 19/20 alive 
297 
Naphthaline, crude, 25 % 
Carbolic acid 24 % 
Oxford grease 72 % 
+ 20/20 „ 
O 20/20 alive 
0 21/21 „ 
* For explanation see footnote p. 537. 
33—2 
