Reviews and Notices of Books

'THIS little book describes t-o new colloidal reactions for the cerebrospiiial fluid, the bi-colour benzoin and bi-colour mastic reactions. In these, an acid and a basic dye are added to the resinous suspension, acid fuchsin and light green to the benzoin and acid-fuchsin and naphthal B-green to the mastic. Shellac has been employed by Marchionini as an alternative to the gum mastic. The advantages claimed for these reactions are increased sensitivity and ease of reading. Other well known colloidal reactions, such as Kafka's paraffin reaction, the " normo-mastic " of Jakobsthal and Kafka, and the Sicard-Haguenau modification of the colloidal gold reaction are described and the result obtained by the various reactions discussed. The book is illustrated -ith several colour plates and contains numerous tables. It forms a usefuil addition to the literature of the cerebrospincal fluid.