(3) There are two possible routes for the electron transfer either from anatase core conduction band to Rutile conduction band or Rutile conduction band to Anatase trap states. The correct electron transfer route has to be established.. The readers are referred to the following publications in this connection 1-6 wherein the superior photo-catalytic activity of heterojunctions has been demonstrated over that of pure anatase or rutile in different reactions. Shi et al., have stated that the combination of anatase and rutile "demonstrates magic effects on carrier transfer in photo-catalytic application" 7 . Another aspect of the studies on TiO2 deals with doping with hetero atoms like C, N, S and others, in these studies it has been reported that the reason for doping with these elements is to shift the photon absorption to visible region. This aspect has been examined recently in a review . These studies must be considered in the light of the observations recorded that the coexistence of Rutile and Anatase phases and the depth of Rutile core and Anatase shell can be tuned by adjusting the "thickness of TiOxCy (x < y) and TiOxCy (x > y) in the precursor composite by a change of the calcinations temperature" 1 . It is necessary that one recalls the repeated reports in literature on the improvement of photo-catalytic activity due to metallization of TiO2 . In a recent publication, Wu et al 10 reported studies on TiO2 single crystals with different percentages of{001} facets and have shown the higher is the percentage of {001} facets, the higher photo-oxidation reactivity and possibly also dependent of the size of the crystal. They postulate that this may be one of the important criterion for many of the oxides in photo-catalytic processes.