GLOSSARY 



107 



Spermiation. The release of the spermatozoa from the testis. 



Spring. A term used in a restricted sense to indicate the period 

 21 March to 20 June in the northern hemisphere, or the 

 period 21 September to 20 December in the southern 

 hemisphere. 



Sum77ier. The period 21 June to 20 September in the northern 

 hemisphere, or 21 December to 20 March in the southern 

 hemisphere. 



Testosterone. The main hormone secreted by the testis. 



Winter. A term used in a restricted sense to indicate the 

 period 21 December to 20 March in the northern hemis- 

 phere, or 21 June to 20 September in the southern 

 hemisphere. 



