Chondroma of the foreleg in a Syrian hamster.

A spontaneous bone tumour in the foreleg of a Syrian hamster was shown to be a chondroma; this is only the second report of such a tumour and the first described in detail.

[Development of equilibrium of glial populations in the cerebral cortex of lead intoxicated rats].

The three types of glial cells (astrocytes, oligodendrocytes and microglia) were counted at 2 different ages in normal and lead intoxicated animals (on a 0.5% Pb2+ diet) and were found to vary differently with respect to age and lead treatment. Satellisation of nerve cells by glia also displays a different pattern : whereas usually at 3 month age, the neurons are surrounded by oligodendrocytes, they appear more often encapsulated by microglia after lead treatment.