SALMOX DEPOSITING ITS EGGS. 31 



current, j)ei'ii^ps she uses only sufficient force 



to hold against the stream. Stones and gravel 



are easily moved under water, and therefore 



the exertion necessary to throw up a bed of 



gravel is not great. To convince myself of 



this I put some gravel into a trough of water, 



and holding a dead fish by the head and on its 



side, I gently undulated it, and I found the 



stones Avere puffed away as if by a gentle 



breeze of wind. I am aware that in all 



books on the subject it is said the male makes 



the ridd, but I am convinced there is no 



truth in this ; the male fish ' wait on,' and 



their whole sj)are time appears to be occupied 



in ' pitching into ' every other male fish 



wdthin sight. They rush on, open-mouthed, 



and generally turn on their side in striking ; 

 and by the time the business is over they are 



