50 Notices respecting New Books. 
animal economy, | conclude that it should occupy in the ve- 
getable kingdom the same place as musk does in the animal, to 
which it has much analogy. In addition to this, I shall add 
another observation which accident enabled me to make in con- 
firmation of the preceding. In the year 1802, I. happened to neg- 
lect a quantity of this extract left to settle in an earthen ves- 
sel, simply covered with a slip of paper which was even badly 
adapted to the handle of the vessel. After fourteen years, having 
accidentally discovered this same extract, I was agreeably sur- 
prised to find that although forgotten so many years, and badly 
covered, it was still in an excellent state, and the odour alone 
which it exhaled was sufficient to convince any one that it was an 
extract of vanilla. I left it inthe same state, and now after six- 
teen years it has all the fragrance of vanilla, almost the same as 
when newly prepared. 
Osservaxiuni per servire alla Storia di una Specie di Julus.— 
«¢ Extract of Observations to illustrate the History of a Species 
of Julus very common in the Plains of Pisa.” By Dr. Pau 
Savi, Assistant Professor of Botany in the University of 
Pisa. 
The species of Julus called by the Italians Centogamle is ge- 
nerally viewed with some feelings of aversion, and hitherto has 
been very little observed, although its powers of destruction are 
very considerable. The individuals of the species here described 
vary in size according to their sex, the males being always less 
than the females; the greatest length of the former amounts to 
two inches and 3-twellf fths, that of the latter to three inches and 
10-twelfths, and thick in proportion. These insects are of a 
blackish brown colour on the upper side, on the under of a 
whitish yellow: their heads are nearly of the same thickness as 
their bodies, round, of a dark colour, somewhat deeper on the 
upper part; in the middle is a small depression with two cavities 
or slight indentations ; the anterior part advances like a kind of 
upper lip, and is rounded in the middle. The eyes are an ob- 
long oval, manifestly composed of several small hemispheric 
black shining eyes. The antennz are placed in two cavities 
under the eyes, are clavated, a little longer than the head, dark 
yellow, pubescent, and composed of seven artidulations. The 
under lip is round, having its external or inferior superfice un- 
equal, with four protuberances, the two lateral and larger ones 
terminating in two obtuse teeth. The mandibles are composed 
of three pieces; the superior is round, deep yellow, very hard, 
dentated, and situated inside the mouth ; ; the middle piece is al- 
most triangular, ofa softer consistence and grayish yellow colour: 
the inferior or third piece is of a cubic figure; the two latter are 
outside 
