LEGUxMIXOS.E PRODUCING TANNING MATTERS AND DYES 335 



spacing of the lines which is usually recommended is 12 ft. 

 bv 6 ft., thus making about twelve to fourteen hundred trees 

 per hectare. 



All these data may be found in the publications of the 

 countries where these plantations occur; unfortunately the 

 results obtained so far vary considerably and no positive 

 conclusion has been reached. 



In the Tropical Agriculturist for September, igo8, Mr. 

 Gisborne relates that thirty trees, eight years old, growing 

 under good conditions, yielded a ton of dry bark. He 

 reckons that, with 150 trees, at the end of eight years the 

 hectare would produce 12 tons of bark at ;{,6 per ton, say 

 ;^72. Taking lands which are rented for pasture in Australia 

 at 2S. per acre, this would be an extremelv good price, not- 

 withstanding the 50 per cent, that must be subtracted for the 

 total expenses. 



In the Tropical Agriculturist for June, 1909, Mr. Kellow 

 gives another estimate of the yield per acre after eight years* 

 time : — 



Rs. 



Expenses for seven years ... ... ... ... 180 



,, the eighth year ... ... ... ... 730 



910 



Crop: 15 tons of bark at Rs. 90 ... ... ... ... 1,350 



1,200 trees for fuel at Rs. o'lj ... ... ... ... 600 



Profit = Rs. 1,040, or Rs. 130 per annul 



1,950 



]^I. Bonfime, who has summarized these different pub- 

 lications in his annual report for 1910, adds that this last 

 estimate appears to be a very high one, and regrets not 

 having been able to obtain more exact figures. 



Large plantations have been made in Natal (50,000 acres), 

 in India, at the Cape, and in German East Africa, &c. 



We shall give a note on all the best-known leguminous 

 plants from which tannin is extracted. It is evident that the 

 analyses that ha\'e been made are b}- no means absolute, as 



