298 PRACTICAL ZOOLOGY 



3. Aquatic biology : 



(a) Economic investigations. 



(b) Explorations and surveys, the methods, apparatus, etc. 



(c) Descriptions of species and faunal lists. 



(d) Morphological, physiological, and pathological studies. 



4. Commercial fisheries and related industries. 



Papers on any of these subjects are mailed free of charge to 

 any one asking for them so long as there are any copies on hand. 



REFERENCES 

 See end of Chapter XXIX. 



