s cover investigational compounds, patents, pharmacology, biochemistry, and clinical studies. This index lists together all compounds for specific tumors. It also has a cancer test index and a miscellaneous index that includes information on tissue culture screening, metabolic functions, and enzyme relationships. One of the best quick reference sources for side effects of drugs is Meyler's Side Effects of Drugs (33). Information is presented in essay form; chapters are divided by drugs. The index is arranged alphabetically by trade name, numbers (in case of experimental drugs), generic name, chemical name, and general classification. Not only are the various reactions explained but case histories are presented. References to orginal sources are given at the end of the chapter. There are a number of card services available for new drugs. Those from abroad are very late. A recent card service in the United States is Drugs in Prospect(34), edited by Paul de Haen. This service is based on current literature and includes chemistry, pharmacology, manufacturers, therapeutic use, trade names, and chemical structure of new compounds. A numerical classification system is supplied for easy filing. A recent survey indicates that 96 percent of its subscribers find it is of greatest value to research scientists. There are many sources to which one can turn, both for United States and foreign products. However, no one directory contains all the information. In keeping up with the current drug developments, your best source is still your own 3 by 5 reference card, with adequate cross ref-