“…Blood sam¬ ples were taken for immunoserological studies. Tests for complement fixation and for antibodies producing passive cutaneous anaphylaxis were performed; the results have already been published (Mancini, Huidobro, Fernandez Collazo & Monastirsky, 1966). In all cases, an equatorial segment of both gonads and the entire epididymis were fixed in Bouin's and Cleland's fluids, embedded in paraffin wax, sectioned and stained by the periodic acid-Schiff method and haematoxylin.…”