_a. Immediate ignition._
_25 November._ The mixture was applied to a skin area of 6 × 3 cm. and
immediately ignited. After burning for 20 seconds, it was extinguished
with water and then wiped off with R 17. A burn appeared, with a
yellowish induration of the skin. Later a thin scab formed. After 3
days, the wound was treated with _liquid echinacine_. On 11 December the
scab fell off; the surface of the wound was dry and rosy red. Epithelium
formed very rapidly; on 21 December only 1/5 of the surface remained
without epithelium. On 29 December this spot too was almost healed.
_25 November._ The mixture was applied to a skin area of the same size
(6 × 3 cm.) and immediately ignited. It burned for 55 seconds until it
went out by itself. The burned spot was wiped off with R 17. There
appeared a yellowish-brown burn which exhibited a cavity at the proximal
end and a blister at the distal end. An elastic scab formed. On the
fourth day the wound was treated with _echinacine ointment_. Thereupon,
on 3 December, the scab began to slough off; on 10 December the wound
was dry and closed; on 13 December only the edge of the wound still
showed a scab and the main part of the wound was covered with fine
granulation. The wound continued to become smaller until 29 December
without healing over.
_b. Ignition after 30 seconds._
_19 November._ The mixture was applied to 2 sq. cm. of skin. After 30
seconds it was ignited and after burning for 40 seconds it was wiped off
with R 17. A dry burn appeared. During the following days a small
oedematous swelling developed. The wound was treated with _liquid
echinacine_. Thereafter, the swelling subsided rapidly, so that on 1
December there remained a clear, dry wound without necrosis.
Subsequently to this a broad zone of epithelization formed and by 29
December the wound had healed with the exception of 0.5 sq. cm. still
lacking epithelium.
_19 November._ The mixture was again applied to 2 sq. cm. of skin,
ignited after 30 seconds, but treated with R 17 only after burning 60
seconds. Here too a dry burn appeared, however with severe reddening and
pain in the surrounding area. The wound formed a necrotic coating. On
the third day it was treated with a 10 percent solution of cod-liver-oil
ointment. On 19 December it was circumscribed and dry. A slow
epithelization began. Later the wounded skin area became similar to the
smooth surrounding area. On 29 December the wound had not yet healed
over.
_c. Application to a piece of cloth covering the skin._
_25 November._ The phosphorus-caoutchouc mixture, applied to a piece of
cloth covering the skin was ignited. Sixty-seven seconds elapsed before
it had burned itself out. The piece of cloth, except for a small
remainder, was carbonized. After it was wiped off with R 17 there
appeared on skin a burn with a central blister which later developed to
a thin, elastic scab. After 3 days the wound was treated with echinacine
ointment. Until 3 December cleaning of the wound took place; at this
date it was dry, rosy red, and closed; a fine granulation covered it.
Thereupon rapid epithelization began. On 29 December it was not yet
healed over.