Published online by Cambridge University Press: 27 March 2009
1. An accurate method of estimating the density of spermatozoa in a suspension by the haemocytometer is described.
2. A rapid method of estimating the density of a semen sample by the use of Brown's opacity tubes is given. There is a simple linear relation between opacity and density, the latter expressed in terms of millions of spermatozoa per ml. being approximately five times the opacity standard.
3. The rapid method is sufficiently accurate for use in insemination centres.