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L. aurifiua and L. chrysorrhea, gold and brown tails ; together with 
C. caja, and C. villica, the garden and the cream spot tiger. All 
these with some persons produced, when handled, either in the living 
or dead state, itching, inflammation, and swelling of the parts affected 
for days. 
There was one very extraordinary fact connected with these hairs, 
viz., that while some were affected even if only the fingers touched the 
hairs, others could handle some with impunity, and could not come 
near others without experiencing discomfort. He had known cases 
where even the-most careful handling of the brown tail had caused 
pain, and the person so affected, incautiously like Reamur, rubbing the 
face, could scarcely see out of his eyes for days after. When the 
hairs of this caterpillar were examined under the microscope the 
wonder ceased, as it would be seen they were admirably adapted to 
penetrate, whichever end touched the skin, while the jagged portion, 
barbed like an arrow, remained firmly fixed in the wound. 
The typical form of hair among caterpillars was cylindrical and 
terminating ina sharp point; the hair itself being composed of the 
same chitonous substance as the skin of the animal, generally hollow 
and lined with a substance, which seemed to resemble cu¢és. Many, 
if not all, hairs, in the living state, contained fluid matter, possibly of 
the same nature as the circulatory fluid of the animal. Instead of 
springing from a bulb, as in mammals, the base of the hair was 
inserted in a socket, a ring-shaped projection, from which the hair 
easily parted company. Examples of simple hairs of this character 
might be obtained from the larvee of the oak eggar and lapret, both of 
which irritated some persons. The larve in each case utilized their 
hairs in forming their cocoons, as was often painfully evident to some, 
when handling them. A member of his family could not touch a 
cocoon of the oak eggar, however old it might be, without annoyance, 
while he could handle them with impunity. 
In the case of the garden tiger, hop dog, and some others, the 
hairs are deeply spinous from point to base. In the satin, sycamore 
tussock, and some others, the spines were thickly studded along the 
whole hair. In the case of the gipsy, the drinker, and the lackey, all of 
which, and especially the last named, punished some very severely, 
the hairs were very fine and beset throughout their length by very 
minute spines, In the brown tail, among longer spinous hairs, were 
