131 
BY HARDOLPH WASTENEYS. 
APPENDIX XI. 
ANALYSES OF SAMPLE OF LAGOON WATER COMPARED WITH 
FILTRATES FROM ANDERSON’S PROCESS. 
~ 
2 4 Minutes contact with 4 minutes contact with 
> Cast Iron Borings, Cast Iron Borings, 
Parts per Million. Aeration, 48 hours Settle- | Aeration, 12 hours Settle- 
=| ment, and Filtration ment, and Filtration 
S through two thicknesses | through three thicknesses 
30 of Berzelius Filter Paper. | of Berzelius Filter Paper. 
=| 
Free Ammonia .O1 .04 .10 
Albutininoid 
Ammonia spe 12 .207 
Oxygen Con- | 
sumed in 15 
Minutes 1.58 .49 .88 
Oxygen con- 
sumed in 4 | 
hours 3.15 1.08 | Ta 
Tron (as Fe.) 57 — .055 
Nitrogen as 
Nitrates nil nil | nil 
Turbidity nil nil | very faint opalescence 
CoLouR—Lovisonp— UNIts. 
Red Beles. cl nil | nil 
Yellow .. rile Seen 0.3 | 0.5 
Odour sre [need day | 
| sw’py | nil | nil 
APPENDIX XII. 
BIOLOGICAL CONTENTS OF LAGOON WATER AT SURFACE NEAR 
OUTLET. 
18m: OF 
Dates Depth rate SERRE Ne C.C Sa uae 
13/8/04 240 — 
10/10/04 264 — 
26/1/05 960 —— 
1/2/05 1040 —— 
8/2/05 Samples 1208 3175 
16/2/05 collectea 1080 1426 
21/2/05 one foot 528 *3425 
22/2/05 below 736 *3008 
3/3/05 surface 596 1302 
15/3/05 344 353 
17/3/05 2960 *14908 
4/4/05 840 1222 
27/4/05 152 198 
*Samples marked thus contained some of the floating scum from the 
surface of the lagoon. 
