"These blocks of stone were buried together in my garden beneath three feet of earth, and remained unopened until the 10th of December 1826, on which day they were examined. Every Toad in the smaller cells of the compact sandstone was dead, and the bodies of most of them so much decayed that they must have been dead some months. The greater number of those in the larger cells of porous limestone were alive. No. 1, whose weight when immured was 924 grains, now weighed only 698 grains. No. 5, whose weight when immured was 1185 grains, now weighed 1265 grains. The glass cover over this cell was slightly cracked, so that minute insects might have entered: none, however, were discovered in this cell; but in another cell whose glass was broken, and the animal within it dead, there was a large assemblage of minute insects; and a similar assemblage also on the outside of the glass of a third cell. In cell No. 9, a Toad which when put in weighed 988 grains, had increased to 1116 grains, and the glass cover over it was entire; but as the luting of the cell within which this Toad had increased in weight was not particularly examined, it is probable there was some aperture in it by which small insects found admission. No. 11 had decreased from 936 grains to 652 grains. "When they were first examined in December 1826, not only were all the small Toads dead, but the larger ones appeared much emaciated, with the two exceptions above mentioned; we have already stated that these probably owed their increased weight to the insects which had found access to the cells, and become their food. "The death of every individual of every size in the smaller cells of compact sandstone, appears to have resulted from a deficiency in the supply of air, in consequence of the smallness of the cells, and the impermeable nature of the stone; the larger volume of air originally inclosed in the cells of the limestone, and the porous nature of the stone itself, (permeable as it is slowly by water, and probably by air,) seem to have favoured the duration of life to the animals inclosed in them without food. "It should be noticed that there is a defect in these experiments, arising from the treatment of the twenty-four Toads before they were inclosed in the blocks of stone. They were shut up and buried on the 26th of November, but the greater number of them had been caught more than two months before that time, and had been imprisoned all together in a cucumber frame placed on common garden earth, where the supply of food to so many individuals was probably scanty, and their confinement unnatural, so that they were in an unhealthy and somewhat meagre state at the time of their imprisonment. We can therefore scarcely argue with certainty from the death of all these individuals within two years, as to the duration of life which might have been maintained had they retired spontaneously, and fallen into the torpor of their natural hibernation in good bodily condition.