§ 165. It has been mentioned as an objection entertained in Germany to the use of clayey soils, on the ground that they retain the gases, and prevent that regular access of air which is necessary (as explained in a portion of evidence already adduced) to allow decay to proceed without putrefaction, which is the most dangerous condition. Good sand and good gravel are of value in the metropolis. It is stated by a gentleman connected with one of the cemeteries, and it is here mentioned to show the prevalent want of knowledge, that it is the common practice when sand and gravel are dug out to form a grave, not to return it, but to fill in with the cheap and coarse, but retentive, London clay. Now the grave-diggers frequently suffer severely in re-opening the graves which are thus filled in by the retentive clay, and require to be stimulated to their work by ardent spirits; and their ghastly appearance, as Mr. Loudon observes, attests the sufferings which they undergo. In another new cemetery, where the grass was very poor, the turf-mounds covering some of the graves was trodden down; on inquiring the reason, it was stated that sheep had been let in to eat the grass, to save the expense of cutting it. Some of the trees and shrubs first planted had not thriven well, and the officers stated that they had not yet been able to persuade the directors to go to the expense of renewing them. In most other cemeteries the plantations were in very good order, and several presented points of improvement, in the architectural arrangements. But, as observed by Mr. Loudon, “nearly all the new London cemeteries, and most of the provincial cemeteries, adopt the practice of interring a number of bodies in the same grave, without leaving a sufficient depth over each coffin, to absorb the greater part of the gases of decomposition.” It may indeed be confidently affirmed that there is scarcely one of the new cemeteries in which one or other of the well established principles of management, in the choice of the site, or the preparation of the soil, or in the drainage, or in the mode of burial, or in the numbers interred in one grave, or in respect to the precautions to prevent the undue corruption of the remains and escapes of dangerous morbific matter, or in the service and officers, or in jurisprudential securities, is not overlooked. (§ 20.)