188 The N.Z. Journal of Science and Technology. [May 
undoubtedly flow through a bed of greensand which contains nodular masses 
in fair abundance. The chief value of the greensand appears to be the rich 
soil it forms as a result of decay under the action of weathering agents. 
The productive Waikari Flat and some of the rich agricultural land near 
Waihao are based on greensands. 
Chemical Results. 
In the field we made considerable use of a “ spot test ” for phosphate, 
described in one of the reports of the Dominion Laboratory. While this 
test gives an indication of the presence of phosphate, it was of no use 
in giving any idea as to the relative richness of the sample. It was 
therefore necessary to collect numerous specimens for further laboratory 
examination. 
Actual analysis was in the majority of cases restricted to determinations 
of sand and insoluble matter, calcium carbonate, and phosphoric anhydride, 
though in some instances iron oxides and alumina were included, and in a 
few cases magnesia. In the following tables only the first three quantities 
are recorded. 
South Canterbury limestones— 
Sand and 
Insoluble 
CaCo 3 . 
p 2 o 5 . 
No. 1 
19-98 
70-98 
1-57 
No. 2 
.. 26-12 
57-77 
3-14 
No. 3 
.. 40-44 
52-68 
0-86 
No. 4 
18-42 
72-60 
1-34 
Weka Pass District limestones— 
No. 7 
.. 39-38 
48-12 
0-93 
No. 8 
.. 37-38 
52-77 
0-67 
No. 9 
9-14 
87-86 
0-38 
No. 24 
.. 29-16 
62-77 
0-22 
No. 28 
12-08 
86-88 
0-16 
No. 30 
.. 55-68 
35-09 
1-34 
Kaikoura District limestones— 
No. 13 
.. 11-96 
82-60 
0-58 
No. 14 
10-40 
82-62 
0-58 
No. 15 
.. 44-48 
43-57 
0-70 
No. 17 
.. 32-62 
62-50 
0-70 
No. 19 
18-10 
79-02 (?) 
2-05 
No. 20 
12-58 
81-24 
1-79 
Nodules— 
No. 10 
.. 17-64 
77-60 
0-48 
No. 11 
19-20 
74-66 
0-58 
No. 12 
.. 20-70 
70-27 
2-72 
Ca 3 P gOg. 
No. 16 
4-46 
66-00 
23-85 
No. 18 
2-54 
32-00 
43-93 
No. 22 
2*38 
n. d. 
51-08 
No. 23 
17-90 
57-10 
10-60 
No. 32 
5-86 
43-60 
47-30 
