225 
A. Bacot ajsd ( A . Talbot 
No. 8. Refined Naphthalene and Camphor. Naphthalene 4, Camphor 1, Vaseline 2. 
No. 9. Crude Naphthalene (Coke Oven) 4, Camphor 1, Vaseline 2, Paraffin wax 4. 
No. 9 a. Crude Coke Oven Naphthalene, 3 pts, Camphor, 1 pt, Japan wax, 3 pts, 
Paraffin wax, 5 pts, Paraffin Molle, 5 pts. 
No. 9 b. Same as 9 a but with 10 pts Naphthalene. 
No. 10. “Crude Parasitox.” (Prepared by Messrs Heppel.) 
No. 11. “Parasitox.” 
No. 12. “Mosquito Wax.” (Prepared by Messrs Lawson and Co.) 
No. 13. “Paraquit Wax.” (Prepared by Messrs Lawson and Co.) 
No. 14. “Paraquit Concentrated Soap.” (Prepared by Messrs Lawson and Co.) 
No. 15. Light Wood Oil Emulsion. (Light Wood Oil, 19 pts, Soft Soap, 10 pts, Caustic 
Soda, 5 pts, Water, 1 pt.) 
No. 15 a. Light Wood Oil, 33 % in a wax preparation. 
No. 16 1 . Carbolic Acid, 1 pt, Soft Soap, 3 pts. 
No. 17. “Midge Cream.” 
No. 18. Quinine Sulphate (neutral), 1 gramme, Alcohol, 95 %, 32 c.c., Water, 11 c.c. 
No. 19. Saffrol, Chlorobenzene and Chrysarobin, combined with Ethyl Chloride. (Put 
up by Messrs Hedley and Co.) 
No. 20. Light Cedarwood Oil, 2 c.c., Paraffin Wax, 3 grs., Vaseline, about 0-75 gr. 
No. 21. Oil of Turpentine, 2 c.c. Paraffin wax, 3 grs., Vaseline, 1 gr. 
No. 22. “Lawson’s Anti-mosquito Compound.” 
No. 22 a. “Lawson’s Anti-mosquito Compound.” (Second sample.) 
VI. A DISCUSSION OF THE PREPARATIONS TESTED. 
Of the preparations tested in Table I, Nos. 1, 3, 4, 5, 6, 8, 9, 12, 13, 15 a, 
22 and 22 a were prepared with wax; Nos. 2, 20 and 21 were of a greasy nature; 
Nos. 15, 18 and 19 were liquids, and Nos. 10,11 and 14 were prepared as soap. 
It was found that the preparations made up with grease, or as soft soaps, 
had the advantage in ease and economy of application. 
The composition of waxy preparations requires some nicety of adaptation 
in relation to the temperature in which it is proposed to use them; if this is 
not done they require warming in order to facilitate spreading, and to obtain 
an even coat, otherwise they tend to waste in use by flaking off, etc. As 
regards endurance, however, waxy preparations have a great advantage over 
greasy or soapy ones, as they form a more permanent covering to the skin, 
and more effectually retard volatilization. To secure any prolonged pro¬ 
tection preparations ought certainly to be made up with wax. 
Fluids form a class apart and require much more skill and care in applica¬ 
tion if waste is to be avoided; this applies more so to highly volatile fluids, 
as was the case with No. 19. 
Soaps, if as hard as Nos. 10, 11 and 14, are best applied by first wetting the 
skin, otherwise they either coat the skin unequally, or flake off; if, however, 
they are of the right consistency they should be as easy to apply as grease or 
soft wax, though they suffer of course from the fact that perspiration will 
remove soap more readily than it will either wax or grease. 
1 No. 10 was not tested against mosquitoes, as a preliminary trial on a small skin area showed 
that it caused considerable irritation. 
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