652 Waring ton ,— The Effect of Bone Acid and Borax on 
were grown with boric acid ; after several weeks, however, a contrast was 
clearly marked, the stunted appearance being quite distinct. In all proba¬ 
bility, since growth was so slow at this time of the year, a comparatively 
long interval was necessary before the deficiency of boron became 
apparent. 
Differences between the shoots of the treated and the control plants 
were not noticed until after eight weeks’ growth even in the case of plants 
set up in August; but at this time the plants without boron were decidedly 
the smaller, and the leaves showed a tendency to turn reddish in colour. 
By December 6 two of these plants were dead and the remainder very 
poor, no signs of flowering being shown even by the end of February. 
The plants supplied with boron, however, grew luxuriantly, those 
receiving the smaller quantity being of a particularly healthy green colour ; 
in other respects there was apparently but little difference between the 
effect of the two concentrations of H 3 B 0 3 , and by the middle of February 
both these sets showed signs of flowering. 
A similar series of plants was set up, also in August, but in this case 
the solutions were not renewed. The results were in close agreement with 
the former series, but there was no flowering and the untreated plants 
succumbed rather more quickly. 
(d) Trifolium repens (Wild White Clover)-. 
Very much less difference was seen between the controls and the boric- 
acid-treated plants than was the case with the crimson clover. 
The controls were certainly inferior, both in the root and shoot, though 
the development in each case was perfectly normal. The plants grown with 
the larger quantity of boric acid were inclined to be yellowish, though those 
receiving the smaller dose were a good colour and, as regards both the 
shoot and root development, quite the best of the series. 
(e) Pismn sativum (Peas). 
(1) Harbinger . For some time no obvious difference was seen between 
the three sets, but later it was clear that the root system was poorer in the 
untreated plants ; the shoots also were inferior, no flowering occurring in 
even a single case. On the other hand, the plants supplied with boric acid 
both flowered and fruited. This lack of flowering may have been due to 
seasonal conditions, as usually this pea flowers freely in ordinary water 
culture. 
(2) Pioneer . This variety of pea was evidently more susceptible to the 
influence of boron than the Harbinger, for the contrast between the controls 
and the plants treated with H 3 B 0 3 was much more marked. In this case 
also the controls failed to flower, although the treated plants both flowered 
and fruited. I he two concentrations of boric acid had apparently much the 
same effect. 
