Egg-ventures has all the pedagogic thoroughness and clarity of Milgrom's previous dalliances with cardboard tubes and straws plus the fun of watching a family of kittenish tigers perform the experiments. Nevertheless, some of the lessons are more worthwhile than others: testing eggs for freshness by seeing whether they float or sink, floating them on salt water, determining their volume and learning to tell hard-boiled eggs from raw ones -- all is moderately involving. On the other hand, the tracing, decorating, frying and rolling of eggs -- or, for that matter, making them stand on end in a small pile of salt -- demonstrate so little that only the most docile ""egg explorers"" will feel a sense of accomplishment. In all this is probably more useful for teaching pre-scientists how to observe and reason than anything about eggs -- and it rates as the most inviting entry so far in a rather unventuresome series.