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This needs to be explained . Now , though those requisite conditions may be , upon many occasions , allowed in the earth , it is not according to the theory of our modern naturalists , who explain petrifaction upon the principles of simple infiltration of water , that any advantage can be taken of those conditions ; nor are natural appearances to be explained without employing more complicated chemical agents in the mineral regions . Having thus endeavoured to remove this prevailing prejudice , of there being primitive parts in this earth , parts of which the composition and constitution are not to be explained upon the principles of natural philosophy , it will be proper to inquire , how far there may be in the theory , which has now been given , principles by which may be explained those appearances that have led natural philosophers to form conclusions , of there being in this earth parts whose origin may not be traced ; and of there being parts whose origin may not be explained upon the same principles which apply so well to all the rest . That also marked the birth of the Singh Parivar.For the uninitiated , the origin of the concept of the Singh Parivar needs to be explained . Just what , for example , is the origin of biological complexity and how is it to be explained ?