ILLUSTRATIONS. VII 



A PRACTICAL METHOD OF SPONGE CULTURE — Continued. Facing page. 



Plate LXXIV. Sheepswool sponge 35 months old, grown from cutting 586 



LXXV. Sheepswool sponge not over 48 months old, grown from cutting 586 



LXXVI. Sheepswool sponge not over 48 months old, grown from cutting 586 



PLATES— PART 2. 



Fish-cultural practices in the United St.-^tes Bureau of Fisheries: 



Plate LX.KVII. (1) Brook trout eggs on tray, just beginning to hatch. (2) Brook trout 

 fry in trough, sac stage. (3) Brook trout fry, sac nearly absorbed, 



about ready to feed 699 



LXXVIII. (4) Hatching equipment for shad and other semibuoyant eggs 702 



LXXIX. (5 amd 6) Taking spawn of whitefish, Detroit River, Michigan 706 



LXXX. (7) Interior of hatchery at Put-in Bay, Ohio. (8) Downing jars set up 



for use 710 



LXXXI. (9) Capturing blackspotted trout in small tributary of Grand Mesa Lake, 

 Colorado. (10) Trap for capturing spawning rainbow trout, Lake San 



C ristobal, Colorado __ — • 712 



LXXXn. (11) Field hatchery at Grand Mesa Lakes, Colorado. (12) Tray of trout 



eggs in hatching trough ....__ 714 



LXXXIII. (13) Series of covered trout-hatching troughs at White Sulphur Springs 

 station. West Virginia. (14) Trout-hatching troughs with Merrill 



aerating cone 718 



LXXXIV. (15) Placing cheese-cloth retainers in pond over nests containing bass fry. 



(16) Pond drawn down and nest boxes placed for spawning 720 



LXXXV. (17) View of fish-culture station at Manchester, Iowa, showing trout and 



bass ponds. (18) Preparing a shipment of black bass 724 



LXXXVI. (ig) Main rack across Battle Creek, California, for intercepting spawning 

 salmon. (20) Seining spawning salmon on the McCloud River, Cali- 

 fornia 7-8 



LXXXVII. (211 Spawntaking operations (salmon) at Baird, California. (22) One 



method of stripping steelhead trout 734 



LXXXVIII. (23) Equipment of McDonald automatic tidal boxes for hatching cod. 



(24) Berried lobsters in course of transfer to hatchery 738 



LXXXIX. (25) Box of trout eggs just opened after shipment. (26) Tray of trout 



eggs with mosquito net and moss in which packed 742 



A NEW PRINCIPLE OF AQUICULTURE AND TRANSPORTATION OF LIVE FISHES: 



Plate XC. 11) Floating laboratory and rearing plant from port side. 2) General 



view from outer rear corner 761 



XCI. 13) Starboard side, looking aft, inside float. 4) Car with propeller in 



motion 780 



XCII. 5) Rearing car raised and held up by portable windlass. 6) Interior of 



rearing car, and propeller 780 



XCIII. I 7) Lifting disconnected propeller out of water. 8) Propeller removed, 



showing disconnected shaft 780 



XCIV. (9) Cleat at end of holding-down plank. 10) Cleats removed, car rising. . 780 

 XCV. Ill) Interior of rearing car. 1 12) Raising car by means of windlass. . . . 780 

 XCVI. 113) View of interior of a car, showing filter of gravel. 14) Filter car 



in operation 780 



XCVII. (15) Filter car, showing bucket chain in operation. (16) Filter car with 



canvas lining 780 



XCVIII. (17) Detail of device for extension and universal movement. iS) Detail 



of lower portion of propeller shaft and its socket in floor of car 780 



