LIST OF ILLUSTRATIONS. XV 



Page. 

 Plate XI 596 



Fig. 45. — Codfish 35 days after impregnation, side view. 



46. — Embryo cod 23 days after impregnation, from below. 



47. Blastoderm of cod'.s egg in optic section, 4 days old. 



48. Similar disk 4 1-2 daj-s old. 



Plate XII 598 



Fig. 49. Head of embryo cod , 27 days after impregnation, side view. 



PLANS OF AQUARIA.* 



Fig. 1. — Ground plan of the Vienna aquarium 633 



2. — Ground plan of the Brighton aquarium 635 



OYSTER-HATCHING APPARATUS.! 

 Plate I. — Apparatus for hatching oyster spat 762 



OYSTER CULTURE.t 



Fig. 1. — Oyster embryo 780 



2.— Oyster spat 784 



3.— Embryo of Oatrea edulis 790 



GREENING OF OYSTER. § 

 Fig. 1. — Navicula fusiformis 798 



FISH CULTURE. II 



Fig. 1. — Crate for transportation of shad eggs 887 



Plate I. —General view of interior of central hatching station 890 



II.— Canning of shad fry for transportation; receiving the eggs and transferring to the 



hatching jars 890 



III. — Making shipment of shad fry 890 



IV. — Arrangement of hatching jars and aquaria for collecting fry of ahad and whitefish 



as hatched 890 



v.— Supply tank for regulating the head of water for the hatching jars under varying 



pressure in the water mains 890 



FISH-HATCHING APPARATUS.H 



Plate I.— Apparatus for operating shad-hatching cylinders 898 



GULF STREAM EXPLORATION.*, 



Plate I. — Principal dredging stations near Gulf Stream 1058 



II. — Slope of ocean bottom 1058 



m. — Temperature curves - 1058 



IV. — Temperature curves 1058 



V. — Temperature curves 105S 



* In Blake's Report on Aquaria in Europe, 

 t In "Winslow'a Eeport of Oyster Experiments. 

 X In Ryder's Development of the Oyster. 

 § In Puys6gur'a Cause of the Greening of Oystera. 

 II In McDonald's Eeport of Central Hatching Station. 

 Illn "Wood's Report of Shad-Hatching Operations. 

 '»In Verrill's Phyaical Charactera of the land beneath the Gulf Stream 



