10 July, 1917.] The Policy of "That'll Do." 421 



When swabbing, the brush or mop should be drawn along spurs or 

 canes from tlie base towards the extremities, so as to avoid breaking 

 off buds. 



The quantity of solution required to swab an acre naturally varies 

 with the number of vines and their development. According to Soutli 

 African experience, 10 gallons of solution suffice for 250 trellised or 500 

 bush vines. In most of our trellised vines 15 gallons should swab an 

 acie. 



In conclusion, all growers who suffered through Black Spot last 

 season, and also those who observed any trace of the characteristic 

 black markings last summer, or who can now find scars on last season's 

 canes, are strongly advised not to neglect the standard swab, as j)er 

 formula given above, early next August. Where last year's visitation 

 was severe, the double swab is recommended, a first application towards 

 the end of July being repeated early in August. 



Very badly affected blocks can, with advantage, receive an addi- 

 tional spraying with Bordeaux mixture, or cop.per soda, in September, 

 when the young shoots are 3 or 4 inches long, repeated a 

 little later siiould wet weather persist. Though copper mix- 

 tures, and even copper sulphate (bluestcne) have been shown to be 

 quite useless as a winter swab, this does not apply to their action during 

 the growing period of the vine. If the surface of all green tissues be 

 well protected by the presence of copper in a slightly soluble form, the 

 germination of summer spores of Black Spot will be prevented in similar 

 manner to that of the spores of other plant diseases usually combated 

 by copper-containing sprays. 



THE POLICY OF " THAT'LL DO."* 



By W. A. X. Robertson, B.]'.Sc., Chief Veterinary Officer. 



The cry for economy, ringing through the world at the present time, 

 has prompted me to draw attention to channels in which it can be 

 applied. These, for convenience, I group under the title of this address 

 — The Policy of "That'll Do." The cry, though it has been heard, has 

 not, I think, been fully appreciated in this land, which has for its 

 greatest pest at present a plague of mice working havoc in the country 

 districts, and to combat which a fight is necessary. 



How much more serious is that fight which is proceeding to rid the 

 world of a pest that not only destroys grain, but everything it comes in 

 contact with, and is laying waste the whole country-side and destroying 

 the most valuable asset of any country — human life! One of the 

 greatest weapons that can be used against this foe is economy. With 

 its use we will be enabled to store up silver bullets, w-hich we have been 

 told on so many occasions will win the war. 



How many of us real'y realize how acute the cry for economy is? 

 In a recent issue of the daily press a cablegram stated that in Kent, 

 in England, a woman was fined £5 for throwing into a dustbin 4 lbs. of 

 pieces of bread; and a Colonel in Bedford was fined £100 for feeding 



* Paper read at the Annual Convention of the Cliamber of .\criculture tielcl at Beniiiffo. July. 1017. 



