OUE INLAUD FISHEEIES. 29 



of most of these operations will he found in the 

 Appendix. The first of these experiments was 

 conducted under Mr. Eobert Buist, the second and 

 last but one under Mr. Eamsbottom, and the Clyde 

 experiment under Mr. Eyre, who is better known 

 as the inventor of an ingenious machine for the 

 transport of live fish to long distances.^ In the two 

 first instances boxes were used which were three- 

 parts filled with gravel, the salmon ova being de- 

 posited in them; in the last, boxes were thought 

 objectionable, and the natural bed of the stream 

 was preferred, and the greater part of the ova of 

 the greyling was accordragly deposited in the gravel 

 (a short account of this operation was published in 

 the Field by Mr. J. Briggs ; a short extract from 

 it will be found in the Appendix). 



When the ova is lying in the gravel it is 

 often attacked by predaceous insects, which prey 

 upon it unceasingly; and the great aim of the 

 pisciculturist is to keep vermin of all kinds from 

 the ova. Now, if the gravel used by the piscicul- 

 turist as the bed on which he deposits the ova he 

 is desirous of hatching, be taken from the bed of a 



1 To these must now be added the most Buccessful attempts 

 to convey salmon ova to Australia, but lately accomplished by 

 Mr. Youl. 



