﻿Report 
  U. 
  S. 
  F. 
  C. 
  1897, 
  (To 
  face 
  peg* 
  323.) 
  

  

  Section 
  on 
  Line 
  A-A. 
  

  

  Plate 
  

  

  , 
  . 
  ■ 
  •*• 
  ;'•'• 
  •■•'<:• 
  ■•■A-/ 
  ■&•-•-••--■••'■•>•"• 
  •■'^ 
  t-'-v-: 
  

  

  Section 
  on 
  Line 
  B-B. 
  

  

  ■.>••'• 
  

  

  ■-- 
  t# 
  •' 
  

   •/•■•.O.t; 
  

  

  '■^?S-{l:SS»v:o:«i?«S;§^^gS^;^^ 
  

  

  •.•^• 
  

  

  :«»' 
  

  

  ".'/! 
  

  

  -.'J 
  

  

  GROUND 
  PLAN 
  AND 
  SECTIONS 
  OF 
  PONDS 
  FOR 
  SPAT-CULTURE. 
  

   Adapted 
  from 
  John 
  A. 
  Ryder. 
  

  

  

  