334 Eleanor A. OrraerocT on the jirevcntion of 



in another Aveek healthy foliage was showing, contrasting 

 with the deep orange-coloured leaves characteristic of the 

 insect attack to the root, and from that time till the 12tli 

 of August, when they were raised for examination, 

 sacrificing good and bad together for comparison, they 

 continued to grow luxuriantly with no return of attack of 

 the "rust" fly. 



Taking the roots in the mass, they showed how sudden 

 the check had been to the insect life. Where the grubs 

 had died from the application of the phenyle, Avhilst there 

 was just sufficient life left in the root to recover, though 

 it was truncated by the loss of the insect-injured portion, 

 it had grown in Avidth, and might be seen as sketched at 

 fig. 1, sometimes with a morsel of the gnaAved extremity 

 still attached. 



Those that had spnmg from seed (even in the very 

 centre of the most infested part), after the application of 

 the "soluble phenyle" were absolutely untouched by the 

 larvffi, and healthy, as also those that had been preserved 

 similarly from attack, and the only notable presence of 

 " rust" Avas in a root, so far from the experimental appli- 

 cation as probably to have escaped the remedy, and the 

 foliage was so exceedingly luxuriant, and clear brilliant 

 green, that the experiment Avas stated to be quite satis- 

 factory by the gardeners I a.sked to examine it, not 

 wishing to trust my oavu opinion. 



I should feel little doubt for the future of checking the 

 attack of the rust insect by a timely application, but from 

 some experiments carried on by leaving pup^ of Otiorlujn- 

 chus svlcatiis in soil soaked Avitli the "soluble phenyle" 

 (little, if at all, diluted), and by Avhich they Avere only 

 exceptionally injured, it a])peared that the larva3 Averc got 

 rid of either by starvation or the unAvholesome state of 

 their food Avhen saturated Avith the chemical fluid, not by 

 external application ; and the question arose, whether 

 phenol comj)ounds present in suffi.cient quantity to destroy, 

 insect life might be objectionable in food roots. 



I had, therefore, a proper analysis made of some of the 

 roots, and it appeared by fractional distillation Avith Avater 

 that a minute quantity of a tarry A'olatile substance Avas 

 separated, this being possibl}^ carbolic acid or a homologue 

 of that substance, the quantity obtained being too small 

 for more precise examination. 



The pectin and sugar Avere stated to be unaltered, and 

 the ash showed nothing beyond Avliat usually exists. 



