" Again after a reference to some of the provisions in Chapter XIV of the Code, it is observed at p. 1157 "Thus, under the Code investigation consists generally of the following steps : (1) Proceeding to the spot, (2) Ascertainment of the facts and circumstances of the case, (3) Discovery and arrest of the suspected offender, (4) Collection of evidence relating to the commission of the offence which may consist of (a) the examination of various persons (including the accused) and the reduction of their statements into writing, if ' the officer thinks fit, (b) the search of places of seizure of things considered necessary for the investigation and to be produced at the trial, and (5) Formation of the opinion as to whether on the material collected there is a case to place the accused before a Magistrate for trial and if so taking the necessary steps for the same by filing of a charge sheet under section 1 7 3. .