Book Reviews 157

The text is clear and amplified by numerous illustrations but the bibliography, although considerable, lacks many important recent references. The English is excellent although terms such as dysoric retinopathy (page 87) might elude the most knowledgeable reader. This book obviously suffers from certain disadvantages when an ophthalmologist enters such a complex and changing field. There is thus confusion between Batten-Mayou disease and juvenile GM2 gangliosidosis, and the complex subject of Niemann-Pick disease could be clarified. The author states that the enzymatic defect of Farber's disease is not known although it was described in 1972. However, the condensation of information into 173 pages is appealing, and this book is strongly recommended for ophthalmologists as a practical way to keep abreast of this exciting field. M. D. SANDERS