VI. QUEENSLAND AGRICULTURAL JOURNAL. [1 Ave., 1899. 
To collect information about value of green manures, it is best to plot out 
exactly one square yard in the field covered with the plant, not picking out a posi- 
tion where the growth is very heavy or poor, but about a fair average. Four pegs 
are driven into the ground at the four corners, and string stretched between 
them ; with a sharp spade all the plants are cut along the strings, so as to get 
really the growth of one square yard. The plants are all collected and 
accurately weighed, passed through a chaffcutter, and the sample for analysis 
taken as above described. In many cases the roots may be also pulled out, 
weighed separately, and a sample forwarded. 
The samples have to be accompanied by a description of the crop—when 
planted, how old when cut, if the land was manured or not, weight of crop per 
acre or per square yard, and weight of the sample forwarded when in its green 
state. In the case of green manures it is generally best to take the ania at 
the same time when ploughed under, just after flowering. 
“THE DISEASES IN PLANTS ACT OF 1896.” 
Department of Agriculture, 
Brisbane, 19th January, 1899. 
H* Excellency the Governor, with the advice of the Executive Council, and in pursuance 
of the provisions of “ The Diseases in Plants Act of 1896,” has been pleased to make 
the following further Regulations. 
J. V. CHATAWAY. 
THE FUMIGATION OF FRUIT FOR EXPORT. 
i. Any one who wishes to erect a chamber or building for the fumigating of fruit is requested 
to give notice to the Under Secretary for Agriculture, who will take steps to see that the chamber 
or building is properly constructed. ; 
2, When it is required to fumigate fruit for export, twenty-four hours’ notice must be given 
to the said Under Secretary or such other officer as may be duly authorised to accept such notice. 
_ 3. The operation of fumigating must be conducted under the control of an officer authorised 
by the Minister for Agriculture. 
_ 4. The fumigating chamber may be made of any convenient size or material, the essential point 
being that it shall be capable of being closed absolutely airtight, and provided with a flue-pipe 
in the roof which can be opened:or closed to allow of the escape of the gas after fumigation. Fhe 
flue must be provided with a box or chamber to contain caustic soda or potash to destroy the gas. 
The fumigating chamber must be provided with a shutter or sliding panel in the lower portion 
of the door or wall. 
Door, flue, and shutter must all be made to close absolutely airtight. 
DirEcTIONS For FumicaTinc wiTtH Hyprocyanic Acrip Gas. 
Proportions of Ingredients.—For every 150 cubic feet of room take 1 ounce of cyanide of potas 
sium, 5 fluid ounces sulphuric acid, 10 fluid ounces water. 
Having placed the fruit to be fumigated in the chamber, see that the flue and the shutter in the 
door or lower part of all are properly closed. 
The acid is then to be diluted in the following manner :—The whole of the water is placed in 
a shallow china or glazed earthenware vessel, such as an ordinary wash-hand basin. (Metal 
vessels are inadvisable unless they are leaden ones.) ‘The sulphuric acid is next poured on to the 
water in a thin stream, stirring the while with a stick. Do not mix by adding the water to the acid. 
The basin containing the acid thus diluted (which should be allowed to cool) is now placed in 
the fumigating chamber, and the cyanide of potassium is emptied into it. 
The gas is given off with great violence, and the door should be immediately closed. 
The whole is now to be left to itself for one hour. At the end of this time the shutters in the 
flue and in the door are opened, and the draught produced drives the gas out of the chamber. 
the end of half an hour the door is thrown open, and if the draught has been effective there should 
be hardly any trace of hydrocyanic gas recognisable. The chamber may be left in this condition 
for another ten minutes or a quarter of an hour. The fruit is now to be moved and allowed to 
remain in a well ventilated place, preferably out of doors, for another half an hour, Samples of 
fruit will be examined from time to time by the entomologist. 
Caution.—As hydrocyanic acid gas is most deadly in its effects on animal life, the greatest 
care must be taken in its use. 
Department of Agriculture, 
Brisbane, > Loe 
: This is to certify that has treated cases of citrus fruit with hydrocyani¢ 
ag fe for one hour, under my supervision, These cases have been branded ‘‘Crown” over 
assed, ’ 
Shipping marks: ‘ 
Per ese: 
Consigned to: 
