Can't show Image in React Native

I'm using react-native 0.28.0

I'm trying to show an image on iPhone simulator according to this tutorial: http://www.appcoda.com/react-native-introduction/

var styles = StyleSheet.create({image: {    width: 107,    height: 165,    padding: 10  }}var imageURI = 'http://books.google.com/books/content?id=PCDengEACAAJ&printsec=frontcover&img=1&zoom=1&source=gbs_api'

Then in the render() function, I add this:

<Image style={styles.image} source={{uri:imageURI}} />

The space allocated for the image is there, but the image is not shown.