330 
Use of Spanish Phosphorite as a Manure. 
of phosphoric acid continued to the last amply sufficient for many 
successive crops of the most exhausting kinds of plants. 
Yet, notwithstanding this latent wealth, it will be seen by the 
following Table that a considerable increase of crop was obtained, 
either by adding manures which contained the same ingredients in 
a more soluble form, such as bones, guano, stable dung, and 
phosphorite, or by substances, like nitrate of soda and sulphate of 
ammonia, the addition of which to the soil miglit favour the 
development of the organization of tlie plant, and thus enable it 
to extract more nourishment from soil of a certain composition 
than it could otherwise do. 
It remains only to be seen, by carrying on the experiment, as 
I hope to do, for some time longer, whetlier the influence of the 
former class of manures will not continue to be felt, whilst that of 
the latter ceases after the year of its application. 
Turiiips. 
Produce per Acre. 
Roots. 
Tops, including all the 
parts above ground. 
Keraarks. 
1. 
14,298 lbs. 
30,591 lbs. 
Decaying. 2 lbs. dried liy 
a water-bath weighed 
looOgr. : burnt, 101-5gr. 
Manured with 
Gain. 
Gain. 
Loss. 
2. 
Sliavings of Bones, 10 
cwt. to tile Acre* 
lbs. 
19,239 
lbs. 
4,941 
lbs. 
33,210 
lbs. 
4,029 
lbs. 
Decaying and small. 
3. 
Chemical Manure — 
Company's Guano, 
200 lbs. to the Acre. 
20,008 
11,700 
28,300 
2,291 
Soiind and tolerably 
equal, but smaller than 
those from Nos. 2, 6, 
and 7. 
4. 
Nitrate of Soila, li cwt. 
to the Acre. 
28,459 
14,101 
45,302 
14,711 
Sound, but rather small. 
2 lbs. dried by a water- 
bath weighed 996 gr. ; 
burnt, 124-5 gr. 
5. 
Spanish Phosphorite, 
applied alone, I2cwl. 
to the Acre. 
6. 
Spanisli Phosphorite, 
witli Sulphuric Acid, 
12 cwt. to the Acre. 
28,039 
30,8(;» 
14,341 
16,071 
42,010 
34,470 
11,425 
3,879 
Sound and tolerably ecjual. 
2 lbs. dried as above 
weighed 996 gr.; burnt, 
103 gr. 
Sound aud tolerably equal. 
South American Guano, 
2C0 lbs. to the Acre. 
31,111 
16,816 
47,000 
16,409 
Sound and tolerably equal, 
2 lbs. dried as aboie 
weighed 1226 gr. ; burnt, 
95 5 gr. 
• Till." small incroasc of produce in this instance may peiliaps be explaiHctl by the ])osition of the 
bed, wliich wus less lavumably circuiUiUnced with reference to £uu uud air tlua the reniaimler< 
