This is the most detailed source of cactus infomation that I have come across in the past eight years. The descriptions are very precise, especially; size, cultural habits,and all the basic growing necessities, with a great number of column cactus included. That's terrific! Most cacti enthusiasts will be overwhelmed by the photos(over 1200), which can captivate anyone into the beauty of cacti. Details such as: number of spines,ribs, and projected size can be a novelty for the ameteur collector. Also, there is added information about growing requirements,such as; light, temperature, water, and different soils mixes to be used for certain cituations. Mr. Innes and Mr. Glass have put together the best book on cacti that I had found,nevertheless, the price is very affordable.