PAGE -Though exposed to a Cold equal to that of Freezing, while in the open Air he remains unaffected, Does not the ftagnant Air of the Cell, deprived in part of Oxygen, and fuperfaturated with fixed Air from his Breathing, produce, together with the Cold, the State of TORPOR? The Bees which were carried to JAMAICA, as they are not confined by Cold, ceased to make Honey after the first Year, and have become very troublesome, In cold Climates, if the Weather is fufficiently fevere, Bees become torpid, and do not confume their Provision, {" 456 457 455 457 If the Weather is not fufficiently cold they consume their Might not an Experiment with a reduced Atmosphere turn out of twofold Advantage with respect to Bees? The Manner in which these torpid Animals ib. ib. are to be re-animated, 456 The Symptoms which arife from a fudden and forced Re-animation, ib. { Vegetables throw out AZOTIC AIR during the 457 During PAGE During the Day they emit VITAL AIR, and SECT. XLIII. OF REST. {Wakefulness. compared to Exertion, and Sleep to Reft, From voluntary Exertion, the Will gets fa- Every one has experienced the Refreshment We ftretch our Limbs after profound Sleep From the SAME CAUSE we yawn, when the CHILDREN, who have abundant Irritability, 457 459 ib. 460 ib. ib. are never eafy but in a Change of Pofition, ib. After After animal Fibres have for fome Time been exerted into Contraction, a Relaxation fuc- ceeds, even though the exciting Caufe 1. a. In our muscular Exertions it is experi- enced, as no one can hang long by b. And the Changes of our Attitude evinces the Neceffity of Relaxation to those Muscles which have been 2. In respect to the irritative Motions this is exemplified in the peristaltic Con- tractions of the Bowels, and the Beatings of the Heart, which cease and are renewed alternately, though the Stimulus of the Aliment and Blood continue to be uniformly 3. In fenfative Motions, as in Fits of the Stone and Gravel, and in Parturi- tion, though the Stimulus is per- {Dr. DARWIN'S Term SENSORIAL POWER explained, VOL. III. By the Motion of a Fibre the IRRITABLE g ib. PAGE though the Stimulus be applied;—till in a certain Time the Fibre has received a due Supply of the IRRITABLE PRINCIPLE, when it becomes again ready to contract from the fame Stimulus, If this Stimulus be withdrawn for a Time, the IRRITABLE PRINCIPLE becomes accumulated, and contracts with equal Energy from the Action of a weaker Stimulus. Or if an equal Stimulus be applied, it is thrown into more violent Action, 1. Thus a State of Sleep fubfifting for fome Time induces a State of the 2. a. Thus if the Stimulus of Heat be b. Thus on a frofty Day with a bleak te 461 462 446 ib. to the Wind is at firft pale and fhrunk: But on turning the Face from the Wind, it becomes foon of a Glow, with Warmth and Flush- c. The Glow of the Skin on emerging from a Cold Bath is owing to the fame Caufe; for by leffening the Quantity of Heat for a Minute or two by going into the Cold Bath, a great accumulation of the IRRI- TABLE PRINCIPLE is neceffarily produced. On emerging from the Bath the irritable Fibre is therefore thrown into greater Exertion by the Stimulus of the Warmth of the These Examples prefent us with the Phæno- ib. |