IT is imagined that the several descriptions of RIVER- 

 FISH, contained in the foregoing pages, are abundantly 

 sufficient for the information of any mere Angler. But 

 those who are curious to know the essential differences 

 between the various species, are hereby recommended to a 

 work entitled Ichthyographia, s. Historia Piscium, by 

 Francis Willughby, Esq. fol. Oxon. 1686; and to a post- 

 humous work of that learned man and excellent naturalist, 

 the Reverend Mr. John Ray, entitled Synopsis Methodica 

 Avium et Piscium, published by Dr. Derham, in Octavo, 

 1713. 



And whereas in page 208, n. it is hinted, that the history 

 (/AQUATIC INSECTS is but little known; and this stupen- 

 dous branch of natural science is well worthy of further 

 investigation; the reader is hereby directed to the perusal 

 of the Life of the Ephemeron, an insect little differing 

 from our green, and grey drake, translated from the Low 

 Dutch of Dr. Swammerdam, by Dr. Edw. Tyson, London, 

 Quarto, 1681. And for his further information on this 

 subject, we have added, as the first number of the Appen- 

 dix to this work, a translation of a Synopsis of these 

 creatures, drawn out from the observations of the above 

 Mr. Willughby, and exhibited in Mr. Ray's Methodus 

 Insectorum, mentioned by Dr. Derham in his Physico- 

 Theology, page 234. 



It is not for the improvement of Angling alone, that the 

 above authors are referred to : the study of the works of 

 nature is the most effectual way to open and enlarge the 

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