elliptical portion of the integuments, a part of the cyst corresponding to which is of course simultaneously removed; the remainder of the sac is pulled out by the forceps. If the adhesions at certain points are firm, they may be touched with the extremity of the knife, so as to expedite the extraction; and if after the operation there is reason to believe that the whole of the secreting surface has not been taken away, a pointed piece of caustic potass may be applied to the suspected parts. If the tumour is very large, the cyst can often be removed without difficulty unopened, sufficient integument being left to cover the exposed surface. In consequence of such operations on the scalp, erysipelas often supervenes, and precautions ought therefore to be adopted to prevent its occurrence, by a little preparation beforehand, by keeping the patient’s bowels freely open, confining him to moderate and mild diet, and avoiding exposure to moist atmosphere and easterly winds. Osseous tumours of the cranium seldom attain any great size, and are in general neither troublesome nor dangerous. Small ivory exostoses are the tumours most frequently met with in this situation, and require no treatment whatever. Tumours of malignant character occur, though rarely; commencing either in the diploe of the skull or on the surface of the dura mater, soon enlarging, and involving the parts around. Two or more sometimes form in one patient; they are attended with excruciating pain, and rapid destruction of the bone, and are followed by extinction of life either at an early or remote period. They are entirely beyond the reach of surgery; as are also those tumours, occasionally met with in children, which project through the cranial sutures and contain fluid; such are analogous to the disease named spina bifida, hereafter to be spoken of. I may here remark, that puncture of the brain, with the view of abstracting fluid in chronic hydrocephalus, is an operation not often likely to be followed by success, and it may even accelerate the fatal issue. Some cases are recorded in which benefit is said to have arisen from the practice. Pressure was applied and kept up after the evacuation of the fluid. DISEASES OF THE EYE AND ITS APPENDAGES.