REAUMUR, RENE ANTOINE FERCHAULT DE. (1683-1757). French entomologist, meteorologist and naturalist; originator of the Reaumur temperature scale. AMs. (Unsigned). 2pp. 4to. N.p., N.d. Autograph manuscript notes for a meteorological experiment plus observations about a caterpillar written on the sheet’s verso.
if very cold air will condense according to the same barometric points as ordinary air does
and if it will condense as much by the same procedures
This is an element which will enter into calculations which are made regarding the weight of air in the atmosphere. There is very cold air in the atmosphere… trial with a mixture of wine spirit in a tube sealed hermetically.”
“the pink caterpillar of the cherry tree. You find the same one, or one that resembles it very much, on the pear tree. It doesn’t have any feelers and a simple [?]. It is quite pretty. The body is a pearl grey and it has a border of [?] yellow on the back and [?] the legs, it is all yellow. It has 16 legs. All the black dots that mark it are small black grains that are raised. They made their cocoon around the fifteenth of July. They are of white silk, rather thin, but tight nevertheless.
1 the caterpillar
2 the cocoon
3 the chrysalid
4 the butterfly born in the month of September or October. It was born while I was not present. It belongs to the class of those with antennae or articulated feelers, (one can distinguish them from fixed feelers) and which have no proboscis. In so far as one can tell from a dead specimen it seems to carry its wings horizontally. The predominant color of the upper wing is a brownish blue on which there are greyish spots. That caterpillar seems to me the same one as that of thorn shrubs.”